Huntress analysts trace one X direct message into separate Mac and Windows malware chains delivering AMOS infostealer and NetSupport Manager RAT.
Huntress SOC analysts dissected a malware campaign distributed via an X direct message styled as a Google Docs sidebar. macOS users were routed to the AMOS infostealer, while Windows users received NetSupport Manager remote access malware. The write-up details how a single message branched into two distinct delivery paths per operating system.
Huntress explains how attackers steal credentials through phishing, AitM, infostealers, and dumping, then use them for lateral movement, BEC, and ransomware.
Huntress published an educational overview of credential theft, citing that roughly 70% of confirmed data breaches begin with stolen credentials. It details acquisition methods including phishing, adversary-in-the-middle attacks that capture MFA session tokens, infostealers (nearly a quarter of threats Huntress observed in 2025), Mimikatz-based credential dumping, credential stuffing, and password spraying. The piece then covers post-theft actions such as lateral movement, privilege escalation, account takeover, business email compromise, and ransomware, and closes with behavioral detection guidance and layered prevention strategies.
Huntress tracked fake GTA 6 downloads distributing NJRAT, DCRAT, Mercurial Grabber, and Chaos ransomware used as a wiper against gamers.
Cybercriminals are pushing fake Grand Theft Auto VI downloads through poisoned search results, gaming forums, torrent sites, and social media, targeting players seeking a leaked build before release. Huntress analyzed a sample bundling NJRAT, DCRAT, Mercurial Grabber, and Chaos ransomware in one package; fake ISO files exceed 100GB largely with junk data, and Russian-language prompts suggest the operators target Russian-speaking gamers. Chaos ransomware acts as a wiper, overwriting files larger than 200MB with random data, deleting shadow copies for admin users, and disabling recovery options rather than offering genuine ransom payment paths.
Huntress details the 20 most common passwords of 2026 and how attackers use brute force, spraying, and credential stuffing against weak credentials.
Huntress published an awareness piece based on NordPass's seventh annual list of the 200 most commonly used passwords, compiled from exposed data in cyberattacks across 44 countries. The top passwords remain simple sequences and variants such as "123456", "admin", "password", and "P@ssw0rd", all crackable in under a second. The article explains four password attack types: brute force, password spraying, credential stuffing, and dictionary attacks. Huntress cites its own data showing more than 1 in 4 IT professionals consider employees' password habits their biggest weakness, and recommends avoiding common passwords, not reusing credentials, and combining letters, numbers, and symbols.
Huntress found fake GTA 6 installer ISOs spreading NJRAT, DCRAT, Mercurial Grabber and a Chaos ransomware wiper that steals credentials.
Huntress analyzed a malicious ISO disguised as a leaked GTA 6 build, distributed via SEO poisoning, torrent sites, and social media, with some images exceeding 100 GB and padded with junk data. The installer stages game-named executables in %TEMP% and deploys NJRAT, DCRAT, and the Mercurial Grabber infostealer, harvesting browser passwords, Discord tokens, Roblox and Minecraft session data, Windows product keys, and cryptocurrency details, with exfiltration via a Discord webhook. A Chaos ransomware variant launched through gta6.exe deletes shadow copies, disables Windows recovery, encrypts files up to 200 MB with AES, and overwrites larger files, effectively acting as a wiper attributed to the 'ASHA Hacker Team'. A Visual Basic script displays a fake 'license not found' error to conceal the already-installed payloads.
Huntress research shows AD RMS SLC root key is unrotatable and never expires, so its compromise permanently exposes all RMS-protected documents.
Part 2 of Huntress's AD RMS series details server-side attacks: extracting the Server Licensor Certificate (SLC) private key and performing offline decryption of protected documents. The SLC key has no expiry or rotation mechanism, with a 255-year certificate validity (2002–2258), so whoever recovers it can decrypt every document the deployment ever protected, indefinitely. The author released SharpRMS, a unified tool combining the 2016 DisARMS client-side attacks with new server-side key extraction and decryption capabilities. The research frames the SLC as comparable to KRBTGT and the DPAPI domain backup key, though not equivalent to domain compromise.
CISA added CVE-2026-86218, a CVSS 10.0 unauthenticated RCE in N-able N-central RMM, to its KEV catalog; on-premises admins must patch to 2026.3.1.14.
CISA added CVE-2026-86218, a CVSS 10.0 static code injection (CWE-96) enabling unauthenticated RCE in N-able N-central, to the Known Exploited Vulnerabilities catalog on September 8, 2026. The flaw affects all on-premises builds before 2026.3.1.14 across the 2025.4 through 2026.3 release lines; N-able shipped Hotfix 4 for 2026.3 on September 5-6, 2026. Huntress research indicates at least one customer's N-central instance was compromised on September 4, and federal civilian agencies must mitigate by September 11 under BOD 26-04. Hosted environments were patched server-side, but a compromised RMM server can serve as a single point of entry into entire MSP client bases.
CISA added CVE-2026-86218 (CVSS 10.0), a pre-auth RCE in N-able N-central, to KEV after N-able confirmed in-the-wild exploitation; patch by September 11.
CISA added CVE-2026-86218, a maximum-severity static code injection flaw enabling pre-authentication remote code execution in N-able N-central, to its Known Exploited Vulnerabilities catalog with a September 11, 2026 deadline for federal agencies. The flaw is fixed in N-central 2026.3 Hotfix 4 (released September 5), and N-able told customers it has been observed being exploited in the wild. Separately, Huntress is investigating the compromise of a fully patched customer N-central environment on September 4 and cannot yet confirm which flaw was used, while Rapid7-disclosed CVE-2026-86206 and CVE-2026-86207 can be chained by an unauthenticated attacker to create a rogue System Administrator account.
N-able patches critical unauthenticated RCE zero-day CVE-2026-86218 in N-central, exploited in the wild; on-premises admins must apply hotfix 2026.3 HF4.
N-able released an urgent hotfix (2026.3 HF4) for CVE-2026-86218 (CVSS 10), an unauthenticated RCE in N-central exploited as a zero-day. Scanning/exploitation attempts observed from IP range 23.234.64.0/18 starting September 4; admins should check logs for scanning and unrecognized new accounts. The hotfix supersedes patches for CVE-2026-86206 and CVE-2026-86207, which Huntress observed potentially chained in the wild to bypass authentication in production environments.
Huntress warns of worm-like attacks using modified ScreenConnect clients to spread VBScript payloads; ConnectWise issued an advisory.
Campaigns starting in late August use social engineering, including Quick Assist abuse, to install rogue ScreenConnect clients that spawn wscript.exe and deploy four VBScript files for reconnaissance, staging, and PowerShell execution. The attackers persist via User Run Keys, attempt UAC bypass, install UltraViewer, and propagate the VBScript chain to other connected ScreenConnect endpoints. ConnectWise published an advisory about a file transfer behavior issue affecting cloud and on-premises ScreenConnect, with a CVE identifier and fix expected within a week; it recommends disabling file transfer meanwhile.
Huntress says rogue ScreenConnect clients spread a four-stage VBScript chain delivering backdoors, privilege-escalation tools, or an XMRig miner to newly connected hosts.
Huntress identified three unrelated August 2026 incidents using a Quick Assist tech-support scam, a phishing-delivered MSI installer, and a fake Geek Squad refund form to install rogue ScreenConnect clients. Each client repeatedly spawned wscript.exe to run 1.vbs through 4.vbs, which profiled the host, enumerated installed security products, and downloaded stage-specific payloads from Dropbox. Depending on detected state, payloads included a user-level ScreenConnect backdoor, UAC-bypass privilege escalation tooling, or tunneling utilities with an XMRig cryptocurrency miner. Infected clients re-infected newly connected hosts, creating worm-like propagation, and ConnectWise issued an advisory about affected file transfer behavior in ScreenConnect.
N-able shipped Hotfix 4 for a CVSS 10.0 unauthenticated RCE (CVE-2026-86218) in N-central RMM, with conflicting statements on exploitation.
N-able released 2026.3 Hotfix 4 (build 2026.3.1.14) fixing CVE-2026-86218, a static code injection weakness (CWE-96) scored 10.0 on CVSS 4.0 that enables pre-authentication remote code execution on on-premises N-central RMM servers. Hosted NCOD instances are already patched; N-able's incident notice says the flaw was observed exploited in the wild while its release notes say exploitation is unconfirmed. Huntress, which has tracked N-central attacks since August, advises IP allowlisting, VPN-only access, or taking internet-reachable servers offline until patching. It is the fourth hotfix in five weeks, following fixes for CVE-2026-86206 and CVE-2026-86207, which CISA added to its Known Exploited Vulnerabilities catalog.
N-able N-central pre-auth RCE zero-day CVE-2026-86218 (CVSS 10.0) is exploited in the wild; on-prem admins must upgrade to 2026.3 HF4.
N-able disclosed a third N-central vulnerability, CVE-2026-86218, a pre-authentication RCE rated CVSS 10.0, and released hotfix 2026.3 HF4 superseding build 2026.3.1.13. Huntress reproduced an exploit chain involving an authentication bypass (CVE-2026-86206/CVE-2026-86207) after a fully patched customer's N-central production server was compromised on September 4. Attackers appended strings like .invalid to account names and probed the /remoteControlAction.do?method=getPierDetails endpoint; Huntress worked with Cloudflare to disable adversary tunnel infrastructure. Hosted N-central instances are already patched; on-prem administrators must upgrade immediately.
PaperCut pre-auth RCE CVE-2026-81578 actively exploited; 47% of tracked installs unpatched and exposed to remote code execution.
Huntress confirmed active exploitation of a pre-authentication RCE flaw in PaperCut (CVE-2026-81578), chainable with CVE-2026-82078 to achieve SYSTEM-level code execution via PaperCut's Application Server. Observed attacks focused on short reconnaissance (whoami, ver, tasklist) with no persistence, but a malicious Java class dropping into the installation directory leaves the jdbc:derby:memory:pwn breadcrumb. Roughly 47% of ~2,500 tracked installations run version 23 or earlier with no patch yet available.
Two actively exploited SonicWall SMA 1000 zero-days chain to unauthenticated RCE; patches released and CISA added both to KEV.
SonicWall disclosed and patched two zero-days in SMA 1000 appliances: CVE-2026-83548, a maximum-severity pre-authentication SSRF, and CVE-2026-83549, a high-severity OS command injection. Rapid7 said chaining the flaws yields unauthenticated remote code execution, and CISA added both to its KEV catalog Wednesday. The vendor provided no IOCs or victim counts, urging customers to hunt for compromise, reimage or redeploy appliances, and reset all passwords and tokens. The product has faced repeated exploitation, including ransomware-linked flaws used by INC and Akira.
Huntress observed rogue ScreenConnect deployments with worm-like VBScript propagation across unrelated organizations, prompting a ConnectWise advisory on file transfer behavior.
Huntress identified multiple incidents in late August 2026 where social engineering led to rogue ScreenConnect remote access clients deployed on victim machines, which then spawned wscript.exe to run four VBScript payloads (1.vbs through 4.vbs) for profiling, telemetry collection, and persistence via a WindowsServiceHost Run key. Modified ScreenConnect clients propagated the VBScript chain to connected endpoints, creating worm-like spread. ConnectWise published an advisory on September 3, 2026, confirming an issue affecting file transfer behavior in both cloud and on-premises ScreenConnect deployments, with a CVE and fix expected within the week; partners were advised to review and disable TransferFiles permissions in the interim.
Attackers chain PaperCut NG/MF flaws CVE-2026-81578 and CVE-2026-82078 for unauthenticated RCE; exploitation observed and a second emergency patch issued.
Two flaws in PaperCut NG and MF — CVE-2026-81578 (CVSS 8.8, improper access control enabling auth bypass) and CVE-2026-82078 (CVSS 9.4, unsafe dynamic class loading) — are being chained for unauthenticated remote code execution. Huntress observed limited exploitation on two customer environments, including Base64-encoded commands, 'whoami & ver' fingerprinting, SimpleHelp execution, and AnyDesk installation for persistence. PaperCut released a second emergency patch for v24, v25, and v26, but watchTowr reports additional patch bypasses may still affect the latest version. Shared IoCs include crafted jdbc strings in server.log and attacker-written .class/.cmd files.
Huntress explains cyber insurance coverage types, insurer security requirements, and the shift toward documented evidence of controls.
Huntress outlines first-party and third-party cyber insurance coverage, including business interruption, data recovery, extortion, privacy liability, and regulatory fines. Insurers now commonly require EDR, MFA, security awareness training, patching, tested backups, least-privilege access, and incident response plans. With ransomware accounting for 91% of insurance losses in H1 2025 and average US breach costs at $10.22 million, underwriters increasingly demand evidence packs rather than self-attestation.
Two chained PaperCut NG/MF flaws, CVE-2026-81578 and CVE-2026-82078, enable pre-auth RCE, with active exploitation confirmed in customer environments.
PaperCut NG/MF is affected by CVE-2026-81578, an improper access control flaw (CVSS 4.0 8.8) allowing unauthenticated configuration changes, and CVE-2026-82078, an unsafe dynamic class loading flaw (CVSS 4.0 9.4) enabling arbitrary Java bytecode execution. Chained, they yield pre-authentication remote code execution on the PaperCut Application Server. PaperCut confirmed active exploitation and customer incidents, and Huntress observed exploitation starting August 26, 2026. Emergency Patch Release 2 is available for NG/MF v24-v26, with IOCs including suspicious pc-app.exe child processes, truncated server.log files, and AnyDesk installs.
A new Huntress survey indicates threat actors frequently target healthcare organizations and banks because of the highly personal data they hold.
Huntress published survey findings indicating that healthcare organizations and banks are frequent targets for threat actors. The piece attributes this to the highly personal information these sectors handle. The article is framed around cyberattack readiness rather than a specific incident.
CISA added two actively exploited PaperCut NG/MF pre-auth flaws to the KEV catalog; federal agencies must patch by September 14.
CISA added CVE-2026-81578 (CVSS 8.8, missing authentication for critical function) and CVE-2026-82078 (CVSS 9.4, unsafe reflection) in PaperCut NG/MF to its Known Exploited Vulnerabilities catalog. Huntress confirmed active pre-authentication RCE exploitation in two customer environments and reproduced the full chain against a clean PaperCut NG 25.0.11 server, chaining the auth bypass into unsafe Java class loading for SYSTEM-level execution. About 47% of roughly 2,500 tracked PaperCut installs still run version 23 or earlier with no patch available, and observed attacker activity was limited to system discovery commands.
Huntress found tampered Exodus crypto wallet installers delivering a modular RAT that steals credentials rather than wallet funds.
Huntress analysts analyzed tampered installers for the Exodus cryptocurrency wallet that bundle a modular remote access trojan. The implant focuses on harvesting credentials instead of draining wallet balances, suggesting broader access theft. The case highlights installer tampering as a supply-chain-style delivery vector for credential-stealing tooling.
Threat actors continue abusing MSP remote monitoring and management tools to reach downstream customers, four years after the Kaseya supply chain attack.
Huntress examines how RMM platforms remain a favored gateway for attackers targeting managed service providers and their clients. A recent incident demonstrates that adversaries still successfully pivot from MSP RMM tooling into downstream customer environments. The piece also covers RMM features, associated risks, and hardening guidance for providers.
Help Net Security's weekly digest highlights 274 compromised Zimbra servers, Gitea and Citrix NetScaler KEV additions, a PaperCut zero-day, and a suspected Iran-linked power plant attack.
The roundup reports at least 274 internet-facing Zimbra instances compromised via CVE-2026-73570, critical Gitea CVE-2026-60004 added to CISA's KEV catalog after exploitation began, and previously patched Citrix NetScaler flaw CVE-2026-8452 exploited in the wild. It also covers PaperCut NG/MF zero-day attacks, a suspected Iran-linked shutdown of a UK power plant, an FBI seizure of domains tied to a China-linked group that hit NASA, DOJ and the Senate, a cyberattack disrupting Boston Scientific, and the Manchester Airports Group breach. Additional items include Chameleon SEO poisoning phishing, Android car head unit proxy botnet malware, ReliaQuest social engineering by ShinyHunters, fake OpenAI Codex macOS malware, and AI-related workforce and supply chain interviews.
Huntress publishes an employee spotlight on cybersecurity advisor Ben Bernstein.
Huntress featured Ben Bernstein, a cybersecurity advisor at the company, in an employee spotlight article. The piece is promotional HR content with no security incidents, vulnerabilities, or research findings.
Huntress links suspected North Korean remote workers to sales, marketing, and healthcare jobs using stolen identities, VPNs, proxies, and KVM hardware.
Huntress investigations identified suspected DPRK remote workers hired beyond IT in sales, marketing, and healthcare/financial organizations, sometimes actually performing the work they were hired for. Fraudulent documents included passports from the same city issued one day apart, ID cards with identical validity dates, and electricity bills built from the same online template with matching typos. A financial-services case found a PiKVM and Guermok USB capture card on a new hire's laptop within hours of delivery, suggesting a laptop farm, and another hire used a police mugshot with the photo digitally swapped. Researchers urge rigorous background checks and identity verification at the interview stage.
Huntress details incidents involving suspected DPRK remote workers (Famous Chollima) in partner environments and shares detection indicators.
Huntress analyzed several incidents involving suspected North Korean remote workers, associated with the activity cluster known as Famous Chollima. The report describes indicators defenders can use to detect and prevent DPRK worker infiltration in customer environments. The scheme centers on operatives obtaining remote jobs at Western companies under assumed identities.
Huntress guidance defines mature identity hardening beyond baseline MFA, covering exception cleanup and detecting identity configuration drift before attackers do.
Huntress argues MFA is only a starting point and outlines what mature identity hardening actually looks like in practice. The guidance covers closing MFA exceptions and coverage gaps that create unauthenticated attack paths. It also stresses catching identity configuration drift before attackers can exploit it.
Huntress launched a new view giving partners visibility into how its SOC investigates security incidents from first signal to resolution.
Huntress announced a new view into its security incident investigation workflow, showing partners how the Huntress SOC progresses cases from first signal to final resolution, including those closed as benign. The feature adds transparency into SOC triage and investigation decisions for managed detection and response customers.
Huntress published an educational guide explaining account takeover (ATO) fraud, how attackers steal credentials, and steps to detect and prevent it.
Huntress released a comprehensive guide on account takeover fraud, which occurs when attackers steal login credentials to gain access to victim accounts. The article is educational rather than incident reporting, covering detection signals and prevention measures such as credential protection. No specific breach, actor, or vulnerability is described.
Huntress reports RMM tool abuse jumped 277% and now appears in nearly 40% of its investigations as attackers leverage trusted remote access software.
Huntress observed a 277% increase in remote monitoring and management (RMM) tool abuse, with such abuse now present in nearly 40% of its investigations. Attackers exploit legitimate, trusted remote access tools to gain access and persistence, complicating detection because the software is expected on endpoints. The write-up explains common abuse patterns and defenses against them.
Huntress argues detection engineers should only delegate security work to AI when outputs can be independently verified.
A Huntress detection engineer argues that the deciding factor for handing tasks to AI is whether the output can be checked, not whether the model is trusted. The piece frames human verification as the gate for delegating security engineering work to AI assistants. It is guidance/opinion aimed at defenders building detections with AI help.
An Akira affiliate rebooted a compromised host into Safe Mode to bypass EDR, but constrained memory crashed the encryptor before encryption completed.
Huntress reports an Akira affiliate gained access on August 4 via an MFA-less SonicWall VPN, enumerated Active Directory, archived file shares with WinRAR, and exfiltrated data to an attacker S3 bucket. The attacker rebooted the host into Safe Mode with Networking and preloaded AnyDesk into the Safe Mode service registry, disabling EDR and Defender's real-time protection for roughly ten minutes. The encryptor failed about 13 seconds after launch with out-of-virtual-memory errors caused by Safe Mode's stripped-down environment, and Defender later removed akira.exe after reboot. Huntress says this is the first observed Safe Mode abuse by Akira, following precedents by Snatch and AvosLocker, and provides detection guidance.
Huntress dissects MacSync Stealer, a macOS infostealer delivered through fake Claude Code download pages in Google search results.
Huntress SOC analysts published a reverse-engineering analysis of MacSync Stealer, a macOS infostealer distributed through fraudulent Claude Code download pages surfaced via web searches. Users searching for Anthropic's Claude coding tool are redirected to fake download pages that install the stealer, abusing developer trust in popular AI tooling. The writeup covers the analysis of the sample and its delivery chain.
Huntress researchers recap standout talks, panels, and villages from this year's Black Hat and DEF CON conferences.
Huntress researchers and SOC analysts published a recap of highlights from Black Hat and DEF CON, covering panels, villages, and standout sessions from Hacker Summer Camp. The post is a community roundup rather than an incident, vulnerability, or research disclosure.
Huntress finds four recent university breaches share one root cause, security misconfigurations, and outlines fixes for higher education.
Huntress analyzed four university breaches from 2026 and identified misconfiguration as the common root cause behind the incidents. The report describes the recurring attack pattern targeting higher education and offers remediation guidance to close the gap. Specific victim institutions, threat actor attribution, and breach volumes are not named in the announcement.
A fake refund scam has targeted Shopify Shop app users for several months, with fraudsters impersonating refunds directly inside the app.
Huntress reports an ongoing fake refund scam aimed at users of Shopify's Shop app. The fraudsters operate directly within the app rather than via email, making the scam harder to spot. The activity has been observed over the past few months, and users should verify refund requests before acting.
Huntress documented an Akira ransomware affiliate attack that failed after its anti-EDR tool crashed legitimate software and stopped encryption before completion.
Infosecurity Magazine reports on Huntress research into a failed Akira ransomware affiliate attack. The affiliate attempted EDR evasion using an anti-EDR tool, but the tool interfered with legitimate software on the client's system. The interference crashed the ransomware before encryption completed, sabotaging the attack; no completed encryption was reported.
Huntress documents an Akira ransomware affiliate rebooting endpoints into Windows Safe Mode to evade EDR and Defender, though Safe Mode broke the ransomware.
Huntress observed an Akira ransomware affiliate rebooting victim machines into Windows Safe Mode to disable EDR and Microsoft Defender before deploying ransomware. In an ironic twist, Safe Mode also prevented the ransomware from executing properly. The post walks through the full attack chain and the defensive lessons.
N-able shipped a second N-central hotfix as attackers actively exploit authentication bypass CVE-2026-18577, attributed to ransomware group Storm-1175.
N-able released Hotfix 2 (N-central 2026.3.1.10) to counter ongoing exploitation of CVE-2026-18577, an authentication bypass that evades the patch for the earlier CVE-2026-18556; exploitation was first detected on August 1, 2026. Post-exploitation includes using the Take Control feature to reach managed endpoints, registering a Cloudflare tunnel service for persistence, creating a 'veeam' domain account, resetting admin passwords, and disabling Microsoft and Sophos security tooling. Microsoft analysts link the activity to Storm-1175, which now deploys a new StormEncryptor ransomware strain instead of Medusa, often reaching data exfiltration and ransomware within days. Sophos and Huntress expanded the IOCs and warned that partners who patched late should treat environments as potentially compromised.
Pre-Auth Static Code Injection RCE in N-able N-central (Exploited in the Wild)
CVE-2026-86218 is a static code injection flaw (CWE-96) in N-able's N-central on-premises remote monitoring and management (RMM) platform, carrying a maximum CVSS 4.0 score of 10.0. An unauthenticated, remote attacker triggers it by sending crafted network input to the N-central server that is improperly neutralized and persisted into application-managed code, which the server then executes — no privileges (PR:N) or user interaction (UI:N) are required. Successful exploitation yields full server compromise with high impact on confidentiality, integrity, and availability, and because N-central acts as the management hub for downstream customer endpoints, compromise can expose the entire managed estate. Any organization running an affected N-central release (before 2026.3.1.14) — primarily MSPs and corporate IT departments using N-able RMM — is affected. The flaw is confirmed exploited in the wild: N-able patched it as a zero-day, CISA added it to the KEV catalog on 2026-09-08, and it is the fourth N-central hotfix in five weeks, though no public PoC is known and ransomware use is unknown.
· N-able N-central before 2026.3.1.14 KEV PoC large
Authentication bypass in N-able N-central internal APIs before 2026.3 HF 3
CVE-2026-86207 is an authentication bypass (CWE-305) in N-able's N-central remote monitoring and management (RMM) platform that allows unauthorized access to APIs that are supposed to be internal-only. It is triggered over the network by sending requests to these internal API endpoints under specific conditions (the CVSS vector indicates some attack prerequisites and a low-privilege foothold are required). An attacker who exploits it gains highly privileged access to the N-central server's data and functions, with high impact on confidentiality, integrity and availability of the server itself. Organizations running any N-central release before version 2026.3 Hotfix 3 are affected — primarily managed service providers hosting N-central for their own operations. There is no public proof of concept, the flaw is not in CISA's KEV catalog, and EPSS puts 30-day exploitation risk at just 0.7%; note that the recent news headlines about actively exploited 'unauthenticated RCE' flaws in N-central describe separate vulnerabilities in the same product, which is why multiple hotfixes have shipped in quick succession.
· N-able N-central all versions before 2026.3 HF 3 (Hotfix 3)moderate
Access Control Filter Bypass in N-able N-central Exposes Internal APIs
N-able N-central contains a flaw in the access-control filter that protects its internal API (CWE-791, incomplete filtering), allowing requests to bypass the filter and reach internal APIs without authorization. The issue is exploitable over the network with no privileges and no user interaction, per the CVSS 4.0 vector (AV:N/PR:N/UI:N). An attacker gains unauthorized, low-impact access to internal APIs (VC:L); the vector indicates no integrity or availability impact and no evidence of code execution from this flaw. Any organization running an affected N-central release — a remote monitoring and management (RMM) platform operated by managed service providers — is affected, and the fix is available in N-central 2026.3 HF3 and 2026.4. The flaw is not on the CISA KEV list and has no known public PoC or confirmed in-the-wild exploitation, though it was disclosed in the same patching cycle as actively exploited N-central unauthenticated RCE flaws.
· N-able N-central Releases prior to 2026.3 HF3; fixed in 2026.3 HF3 and 2026.4large
Unsafe Reflection RCE in PaperCut NG/MF, Chained with Auth Bypass in Attacks
CVE-2026-82078 is an unsafe dynamic class loading flaw (unsafe reflection, CWE-470) in the database connection utilities of PaperCut NG and PaperCut MF: the software instantiates a database driver class based on a configurable driver name without validating it against an allowlist of approved drivers. An attacker who can manipulate system configuration parameters can point that setting at classes of their choosing, causing the server to execute arbitrary Java bytecode residing on the application classpath in the security context of the PaperCut server process. On its own the issue is rated 9.4 (Critical) with high privileges required, but when chained with the companion authentication bypass CVE-2026-81578 it yields unauthenticated remote code execution on the print-management server. All PaperCut NG and MF deployments are in scope; affected version ranges were not specified in the available data, so administrators should consult PaperCut's advisory for fixed versions. The flaw is confirmed exploited in the wild as a zero-day: it was added to CISA's KEV catalog on 2026-08-31, and public reporting describes an AI-orchestrated campaign that compromised PaperCut servers at roughly 395 organizations (~440 servers), with EPSS currently at 1.7% (76th percentile).
Missing Authentication for Critical Function in PaperCut NG/MF Web Interface
CVE-2026-81578 is an improper access control flaw (CWE-305) in the web management interface of PaperCut MF and PaperCut NG in which administrative requests from unauthenticated remote users trigger backend actions before access validation completes. An attacker can invoke administrative functions without logging in, allowing modification of certain system configurations. When chained with CVE-2026-82078 (unsafe dynamic class loading), the flaw has been used to achieve unauthenticated code execution. Any organization running PaperCut NG/MF, particularly servers whose web management interface is reachable from the internet or untrusted networks, is affected. The vulnerability was added to CISA KEV on 2026-08-31 and is being exploited in the wild as part of an AI-orchestrated campaign that compromised roughly 395–440 organizations.
Authentication Bypass (Alternate Path/Channel) in N-able N-central
N-able's N-central RMM platform contains an authentication bypass (CWE-288) in which an alternate path or channel allows requests to skip the normal authentication check. An unauthenticated attacker can trigger it by sending requests through that alternate path without valid credentials, gaining unauthorized access to the N-central management interface; because N-central is remote monitoring and management software run by managed service providers, such access can expose management functions across downstream customer environments. N-able N-central deployments are affected; the available data does not specify affected version ranges or fixed builds. The flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2026-08-04, confirming exploitation in the wild, with a high EPSS of 40.2% (99th percentile), no CVSS score yet, no public PoC, and undetermined ransomware use; related reporting describes a recent string of N-central hotfixes, including fixes for unauthenticated remote code execution.
Authentication Bypass and Account Takeover in N-able N-central (Incomplete Patch)
CVE-2026-18577 is an authentication bypass (CWE-288) in N-able's N-central RMM platform caused by an incomplete patch for the earlier vulnerability CVE-2026-18556. Because the original fix can be bypassed via an alternate path or channel, a remote, unauthenticated attacker needs no privileges or user interaction, though the attack requires meeting exploit-specific conditions (high attack complexity, CVSS 4.0: 8.2 High). Successful exploitation lets the attacker bypass authentication and take over N-central accounts, gaining high-impact access to the management console with limited direct effects on downstream services. All N-central versions through 2026.3.1 are affected. Exploitation is confirmed in the wild: the flaw was added to CISA's KEV on 2026-08-03, EPSS estimates a 54.1% chance of exploitation within 30 days (99th percentile), and news reports say attackers kept exploiting it even as N-able shipped successive hotfixes; ransomware use is currently unknown.
· N-able N-central all versions through 2026.3.1 (incomplete patch for CVE-2026-18556) KEVmoderate
Insecure Deserialization Code Execution in N-able N-central (KEV)
CVE-2025-8875 is a deserialization of untrusted data flaw (CWE-502) in N-able's N-central remote monitoring and management (RMM) platform, which runs on servers used by managed service providers to administer customer environments. An attacker can trigger it by getting the product to process crafted serialized data; the CVSS 4.0 vector indicates the attack is network-adjacent/over the network (AV:N) with only low privileges required (PR:L) and no user interaction. Successful exploitation yields code execution on the N-central server with high impact to confidentiality, integrity, and availability, giving attackers a foothold in a system that typically holds credentials and connectivity to many downstream customer networks. Any organization running an N-central release before 2025.3.1 is affected, primarily MSPs and the end customers they manage. The flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2025-08-13 after reported customer compromises, with EPSS estimating a 1.7% chance of exploitation within 30 days; no public proof-of-concept is known.
· N-able N-central all versions before 2025.3.1 KEVlarge
Unauthenticated OS Command Injection RCE in Synacor Zimbra Collaboration Suite
CVE-2026-73570 is an OS command injection vulnerability (CWE-78) in Synacor Zimbra Collaboration Suite (ZCS) before 10.1.20, caused by improper sanitization of untrusted input during SNMP notification processing. It is triggered when the optional zimbra-snmp package is installed and SNMP notifications are enabled: an unauthenticated attacker sends specially crafted SMTP requests that the flawed notification path turns into execution of arbitrary operating system commands. Successful exploitation runs commands as the Zimbra user, giving attackers control of the mail server's service account with high confidentiality and integrity impact across the host. Only ZCS deployments running the optional SNMP component with notifications enabled are vulnerable; other Zimbra installs are not exposed to this specific flaw. The flaw is under active exploitation: CISA added it to the KEV catalog on 2026-08-21, Poland's CERT has warned of in-the-wild attacks, unpatched Zimbra servers are reported compromised, and two public proof-of-concept exploits exist.
· Synacor Zimbra Collaboration Suite (ZCS) before 10.1.20 (when the optional zimbra-snmp package is installed and SNMP notifications are enabled) KEV PoC ×4large
Memory Buffer Overflow in Citrix NetScaler ADC/Gateway Exploited in the Wild
CVE-2026-8452 is a memory buffer overflow (CWE-119) in Citrix NetScaler ADC and NetScaler Gateway that applies when the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, or RDP Proxy) or as an AAA virtual server. The flaw is reachable over the network without authentication (CVSS 4.0: AV:N/PR:N), so an unauthenticated attacker can trigger it remotely. Successful exploitation causes unpredictable or erroneous appliance behavior and denial of service, and the high confidentiality score suggests possible disclosure of memory contents; some reporting suggests pre-authentication remote code execution may be possible, though the vendor description emphasizes DoS. Organizations running affected NetScaler appliances in a Gateway or AAA role — a very common configuration for remote access to Citrix virtual apps and desktops — are potentially exposed. The flaw was added to CISA's KEV catalog on 2026-08-26 and is reported as exploited in the wild, with headlines noting the flaw was already patched before exploitation was confirmed.
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