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May 2026 CVE Landscape
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Researcher Explains Release of Undisclosed Zero
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Critical N-able N-central Vulnerability and Active Exploitation
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.
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Threat Brief: OWASSRF Vulnerability Exploitation
Unit 42 details active exploitation of Exchange SSRF flaws CVE-2022-41080/CVE-2022-41082 via the OWASSRF method, deploying the SilverArrow PowerShell backdoor.
Unit 42 documents OWASSRF, an exploit chain combining CVE-2022-41080 and CVE-2022-41082 to achieve remote code execution on Microsoft Exchange via Outlook Web Access, bypassing Microsoft's ProxyNotShell mitigations. Active exploitation was observed in late November and early December 2022, affecting at least eight organizations. Attackers authenticated to Exchange, then executed a PowerShell backdoor tracked as SilverArrow to create admin accounts, install AnyDesk, tunnel RDP via PuTTY Link, and dump LSASS memory for credential theft. Exploitation is isolated rather than mass-scale because authentication is required.
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Microsoft Fixes Two Zero
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New PoC Exploit for Apache OfBiz Vulnerability Poses Risk to ERP Systems
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⚡ THN Weekly Recap: Top Cybersecurity Threats, Tools and Tips [3 February]
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Microsoft posts nearly 1,000 bugs for Patch Tuesday as CISA warns two being exploited
CISA confirms exploitation of two Windows zero-days among 973 Microsoft patches; 22,000 Exchange servers remain unpatched.
Microsoft's September Patch Tuesday sets a record with 973 vulnerabilities, and CISA confirms CVE-2026-81963 and CVE-2026-85880 are being exploited, giving federal agencies until September 22 to patch. Nightwing estimates over 22,000 corporate Exchange servers are unpatched against weaponized exploit code. Analysts describe CVE-2026-81963 as an early link in ransomware chains where phishing leads to privilege escalation, and note year-to-date Microsoft disclosures exceed 2,600 bugs.
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Human Attacker Exploits Marimo RCE, Reaches SSH Bastion in Eight Seconds
Sysdig documents a skilled human attacker exploiting Marimo pre-auth RCE CVE-2026-39987 (CVSS 9.3), reaching an SSH bastion in eight seconds without AI tooling.
Sysdig detailed exploitation of CVE-2026-39987 (CVSS 9.3), a pre-authenticated RCE affecting all Marimo versions that came under active exploitation within hours of disclosure. A human operator used a hand-written Python script to harvest an AWS key from Secrets Manager and SSH into a bastion host in eight seconds, issuing 850+ commands over nine hours. Separately, Hunt.io disclosed an XMRig cryptomining campaign compromising 3,562 Redis servers via SLAVEOF rogue replication and AOF authorized_keys injection. Operation CameraSwarm, linked to a single operator, compromised over 14,000 Dahua IP cameras using CVE-2021-33044 and CVE-2021-33045.
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Critical Unpatched SharePoint Zero-Day Actively Exploited, Breaches 75+ Company Servers
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Microsoft Fixes Two Zero
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Week in review: PostgreSQL databases under attack, new Chrome zero-day actively exploited
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CISA Warns of Critical GitLab Vulnerability Exploited in Attacks
CISA added actively exploited GitLab path traversal flaw CVE-2026-85706 to its KEV catalog, warning unauthenticated attackers can read arbitrary files including secrets.
CISA added CVE-2026-85706, an unauthenticated path traversal vulnerability (CWE-35) in the repository commits API of GitLab Community and Enterprise Editions, to its Known Exploited Vulnerabilities catalog on September 11, 2026, with a remediation deadline of September 14, 2026. The flaw allows arbitrary file reads via improper path confinement, potentially exposing configuration files, access tokens, private keys, and CI/CD variables that enable further intrusion and supply chain compromise. CISA requires forensic triage under Binding Operational Directive 26-04 and urges defenders to review logs for traversal requests and rotate potentially exposed credentials after patching.
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Week in review: Windows zero-day exploited, Patch Tuesday forecast, selecting a compliance solution
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