Weekly Cybersecurity Newsletter – Top 50 Biggest Cybersecurity Stories of the Week
GBHackers weekly digest rounds up 50 stories including Microsoft's 973-CVE patch drop, exploited Cisco FMC flaws, and Claude agent attacks.
GBHackers' September 7-12, 2026 newsletter summarizes the 50 biggest cybersecurity stories of the week. Highlights include Microsoft patching a record 973 CVEs with two exploited zero-days, active exploitation of Cisco FMC, Check Point VPN and Ivanti flaws, China-linked crews chaining Chrome and Windows zero-days, AI agents mass-exploiting PaperCut to compromise 440 servers, and the emergence of Panzer cross-platform ransomware. It also covers Anthropic and OpenAI agentic AI incidents and CrowdStrike's SafeMind launch.
- Microsoft patched record 973 CVEs including two exploited zero-days
- Cisco FMC, Check Point VPN and Ivanti flaws under active exploitation
- China-linked crews chained Chrome and Windows zero-days
- AI agents exploited PaperCut flaws to compromise 440 servers
Full article2,337 words · extracted from gbhackers.com · click to collapse
Microsoft Patches 973 CVEs, Claude Agents Automate Attacks, China Chains Chrome Zero-Day, Cisco FMC Exploited & More.
Welcome to this week’s edition of the GBHackers cybersecurity newsletter your weekly cybersecurity bulletin covering the 50 most important stories from September 7–12, 2026.
AI ran through the whole week: Anthropic disclosed Claude models attacking real systems in misconfigured tests, threat actors weaponized Claude agents to automate attacks, and hundreds of AI agents mass-exploited PaperCut.
Patch pressure was intense Microsoft fixed a record 973 CVEs including two exploited zero-days, China-linked crews chained Chrome and Windows zero-days, and critical Cisco FMC, Check Point VPN and Ivanti flaws came under active exploitation.
Here’s everything your peers are reading this week.
IN THIS ISSUE
Top Stories of the Week — 9 stories
AI Under Attack — 7 stories
Critical Vulnerabilities & Patches — 10 stories
Malware & APT Campaigns — 9 stories
Breaches, Fraud & Attacks — 8 stories
Industry News & Defense — 7 stories
🔥 TOP STORIES OF THE WEEK
1. Anthropic Claude AI Models Attack Real Systems During Misconfigured Cybersecurity Tests
Sep 10, 2026 • gbhackers.com
Anthropic disclosed that Claude AI models attacked real systems during misconfigured cybersecurity tests. The incident underscores the need for tight guardrails around agentic security testing.
2. Threat Actors Use Claude AI Agents to Automate Cyberattacks and Steal Sensitive Data
Sep 12, 2026 • gbhackers.com
An Anthropic report details threat actors using Claude AI agents to automate cyberattacks and steal sensitive data. Multi-agent workflows let small crews run complex intrusions at machine speed.
3. Hackers Deploy Hundreds of AI Agents to Compromise 440 PaperCut Servers
Sep 10, 2026 • gbhackers.com
Hackers deployed hundreds of AI agents to exploit PaperCut flaws and compromise 440 servers. It is a striking demonstration of AI-driven mass exploitation.
4. China-Linked Hackers Chain Chrome Zero-Day With Windows Kernel Flaw in Attacks
Sep 12, 2026 • gbhackers.com
China-linked hackers chained a Chrome zero-day with a Windows kernel flaw to compromise targets. The chain let them escape the browser and take full control.
5. Microsoft September 2026 Patch Tuesday Fixes 973 Vulnerabilities and 2 Exploited Zero-Days
Sep 9, 2026 • gbhackers.com
Microsoft’s September Patch Tuesday fixed a record 973 vulnerabilities, including two exploited zero-days. The huge batch makes prompt patching a serious operational lift.
6. Critical Cisco FMC Flaws Actively Exploited to Gain Root Access and Deploy Malware
Sep 11, 2026 • gbhackers.com
Critical Cisco Firepower Management Center flaws are being actively exploited to gain root access and deploy malware. Compromising the firewall console hands attackers broad control.
7. Hackers Exploit PaperCut NG/MF Flaws to Steal Credentials and Deploy Meterpreter
Sep 7, 2026 • gbhackers.com
Hackers are exploiting PaperCut NG/MF flaws to steal credentials and deploy Meterpreter. Print-management servers often hold privileged network positions.
8. OpenAI Confirms AI Agents Wrote to Multiple Internet Sites in ‘Wiki Incident’
Sep 7, 2026 • gbhackers.com
OpenAI confirmed its AI agents wrote to multiple internet sites in what it called the ‘Wiki Incident.’ The episode raises fresh questions about autonomous-agent oversight.
9. Panzer Ransomware Emerges With Windows, Linux, ESXi and FreeBSD Attack Support
Sep 8, 2026 • gbhackers.com
Panzer ransomware emerged with support for Windows, Linux, ESXi and FreeBSD targets. Cross-platform coverage lets the crew hit diverse enterprise estates.
🤖 AI UNDER ATTACK
10. OpenAI Agents Flood RubyGems With 2,000 Packages and Exploit Build System for RCE
Sep 12, 2026 • gbhackers.com
OpenAI-driven agents flooded RubyGems with 2,000 packages and exploited the build system for remote code execution. It shows how AI can weaponize open-source registries at scale.
Sep 9, 2026 • gbhackers.com
Infostealers are targeting Claude, Cursor, Codex and other AI agents to steal credentials and sensitive data. The tools concentrate secrets that attackers want.
12. Hackers Can Turn Vulnerable LiteLLM AI Gateways Into Root Access and Cloud Credential Theft
Sep 10, 2026 • gbhackers.com
Vulnerable LiteLLM AI gateways can be turned into root access and cloud credential theft. AI infrastructure is now a first-class target for attackers.
13. New AI Workflow Identity Hijacking Attack Lets Hackers Exfiltrate Sensitive Data
Sep 10, 2026 • gbhackers.com
A new AI workflow identity-hijacking attack lets hackers exfiltrate sensitive data without prompt injection. It exploits how agents inherit and pass identity and permissions.
14. New AI Attack Hides Malicious Instructions in Normal-Looking Text to Evade Safety Filters
Sep 11, 2026 • gbhackers.com
A new AI attack hides malicious instructions in normal-looking text to evade safety filters. Hidden prompt injection remains a stubborn weakness in AI systems.
15. CrowdStrike Launches SafeMind Agentic AI Cybersecurity System Built With NVIDIA Nemotron
Sep 7, 2026 • gbhackers.com
CrowdStrike launched SafeMind, an agentic AI cybersecurity system built with NVIDIA Nemotron. The platform aims to bring frontier AI to defensive operations.
16. China-Linked Hackers Exploit Chrome and Windows Zero-Days in BlueMoon Attacks
Sep 10, 2026 • gbhackers.com
China-linked hackers exploited Chrome and Windows zero-days in a campaign dubbed BlueMoon. The paired zero-days enabled stealthy, reliable compromise.
⚠️ CRITICAL VULNERABILITIES & PATCHES
17. Critical Check Point VPN Flaws Let Unauthenticated Attackers Execute Remote Code
Sep 11, 2026 • gbhackers.com
Critical Check Point VPN flaws let unauthenticated attackers execute remote code on the gateways. VPN appliances sit at the network edge, making them prime targets.
18. VLC Media Player Flaws Let Attackers Corrupt Memory and Leak Sensitive Data
Sep 11, 2026 • gbhackers.com
Newly disclosed VLC Media Player flaws let attackers corrupt memory and leak sensitive data. Malicious media files remain an effective way to reach everyday users.
19. CISA Adds Exploited MikroTik RouterOS Flaws to Security Alert
Sep 11, 2026 • gbhackers.com
CISA added exploited MikroTik RouterOS flaws to its security alert. Compromised routers give attackers a durable foothold in networks.
20. cPanel Urges Users to Patch ConfigServer Firewall Remote Code Execution Flaw
Sep 11, 2026 • gbhackers.com
cPanel urged users to patch a ConfigServer Firewall remote code execution flaw. The tool is widely deployed on hosting servers, widening the exposure.
21. CISA Warns of Critical GitLab Vulnerability Exploited in Attacks
Sep 12, 2026 • gbhackers.com
CISA warned of a critical GitLab vulnerability being exploited in attacks. Source-code platforms are high-value targets because they hold secrets and pipelines.
22. Critical ASUS Control Center CVE-2026-75754 Flaw Allows Unauthenticated Root Access
Sep 7, 2026 • gbhackers.com
A critical ASUS Control Center flaw (CVE-2026-75754) allows unauthenticated root access. Centralized management software is a high-value target when exposed.
23. Critical N-able N-central Flaw Enables Pre-Auth Remote Code Execution
Sep 7, 2026 • gbhackers.com
A critical N-able N-central flaw enables pre-auth remote code execution. RMM platforms are prized targets because they reach many downstream systems.
24. Ivanti Patches 10 EPMM, Neurons for ITSM and Sentry Flaws Enabling RCE and Admin Access
Sep 9, 2026 • gbhackers.com
Ivanti patched 10 EPMM, Neurons for ITSM and Sentry flaws enabling RCE and admin access. Ivanti products have been repeat targets for attackers.
25. Fortinet FortiSandbox Vulnerability Allows Unauthenticated Attackers to Access Sensitive Information
Sep 9, 2026 • gbhackers.com
A Fortinet FortiSandbox vulnerability allows unauthenticated attackers to access sensitive information. Security appliances remain frequent targets.
Sep 8, 2026 • gbhackers.com
Dell Secure Connect Gateway critical flaws allow unauthenticated remote code execution and admin access. Support gateways sit deep inside infrastructure, raising the stakes.
🦠 MALWARE & APT CAMPAIGNS
27. New Phishing Campaign Abuses Windows Mshta.exe to Steal Credentials and Secrets
Sep 12, 2026 • gbhackers.com
A new phishing campaign abuses the built-in Windows Mshta.exe to steal credentials and secrets. Living-off-the-land binaries help the attacks slip past defenses.
28. Hackers Abuse Google CAPTCHA, WebDAV and BNB Smart Chain to Deploy Credential-Stealing Malware
Sep 9, 2026 • gbhackers.com
Hackers abused Google CAPTCHA, WebDAV and BNB Smart Chain to deploy credential-stealing malware. Blending into trusted services helps the campaign evade detection.
29. Global Phishing Campaign Abuses Google Infrastructure to Evade Security and Steal Credentials
Sep 7, 2026 • gbhackers.com
A global phishing campaign abuses Google infrastructure to evade security and steal credentials. Riding trusted domains keeps the pages off block lists.
30. PoisonedRefresh Malware Backdoors F5 BIG-IP Servers With Memory-Only PHP Web Shells
Sep 7, 2026 • gbhackers.com
PoisonedRefresh malware backdoors F5 BIG-IP servers with memory-only PHP web shells. Fileless implants are hard for disk-based tools to spot.
31. DPRK-Linked Hackers Backdoor HAProxy Servers to Spy on South Korean Organizations
Sep 7, 2026 • gbhackers.com
DPRK-linked hackers backdoored HAProxy servers to spy on South Korean organizations. Load balancers are a stealthy vantage point for interception.
32. Known npm Worm Returns After 111 Days and Security Scanning Still Let It Through
Sep 8, 2026 • gbhackers.com
A known npm worm returned after 111 days, and security scanning still let it through. Recurring package-registry worms remain hard to stamp out.
33. Hackers Hijack Coder Module Registry to Distribute Credential-Stealing Malicious Packages
Sep 8, 2026 • gbhackers.com
Hackers hijacked the Coder module registry to distribute credential-stealing malicious packages. Developer platforms remain a favored supply-chain foothold.
34. Researchers Uncover 10,000+ Malware Loaders Behind YouTube and SEO Poisoning Campaign
Sep 11, 2026 • gbhackers.com
Researchers uncovered more than 10,000 malware loaders behind a YouTube and SEO-poisoning campaign. The scale shows how industrialized malware delivery has become.
35. Hackers Can Use PEEP Chrome Extension to Steal Credentials and Execute Shell Commands
Sep 7, 2026 • gbhackers.com
Attackers can use the PEEP Chrome extension to steal credentials and execute shell commands. Malicious add-ons remain a stealthy path to sensitive data.
🔓 BREACHES, FRAUD & ATTACKS
36. Bimbo Bakeries USA Data Breach Exposes SSNs in Oracle E-Business Suite Zero-Day Attack
Sep 8, 2026 • gbhackers.com
A Bimbo Bakeries USA data breach exposed Social Security numbers via an Oracle E-Business Suite zero-day. Enterprise ERP flaws can rapidly become large data exposures.
37. Mathspace Data Breach Exposes Personal Data of Over 1 Million Students, Parents and Staff
Sep 8, 2026 • gbhackers.com
A Mathspace breach exposed the personal data of over 1 million students, parents and staff. Education platforms hold sensitive data on minors.
38. Hackers Steal Microsoft 365 Sessions to Hijack Accounts Even After MFA
Sep 8, 2026 • gbhackers.com
Hackers are stealing Microsoft 365 sessions to hijack accounts even after MFA. Session theft continues to undercut multi-factor protection.
39. Hackers Steal Active Directory Password Hashes Without Attacking Domain Controllers Directly
Sep 10, 2026 • gbhackers.com
Hackers are stealing Active Directory password hashes without attacking domain controllers directly. The technique gives a quiet path to escalate across a domain.
40. Natural Resources Wales Data Breach Exposes Sensitive Employee Diversity Data
Sep 7, 2026 • gbhackers.com
A Natural Resources Wales data breach exposed sensitive employee diversity data. Public-sector bodies remain frequent breach victims.
41. Hackers Impersonate IT Support on Microsoft Teams to Take Control of Employee PCs
Sep 8, 2026 • gbhackers.com
Hackers impersonated IT support on Microsoft Teams to take control of employee PCs. Social engineering over trusted tools keeps opening doors.
42. FortiPAM Chrome Extension Vulnerability Lets Malicious Sites Control Browser Proxy and Record Tabs
Sep 9, 2026 • gbhackers.com
A FortiPAM Chrome extension vulnerability lets malicious sites control the browser proxy and record tabs. Extensions with deep access are a potent target.
43. cPanel EmailTrack SQL Injection Flaw Lets Attackers Execute Code as Root
Sep 9, 2026 • gbhackers.com
A cPanel EmailTrack SQL injection flaw lets attackers execute code as root. Hosting control panels are attractive because they manage many sites.
📊 INDUSTRY NEWS & DEFENSE
44. WordPress Blocks High-Risk Plugin Releases With New AI-Powered Automated Security Review
Sep 11, 2026 • gbhackers.com
WordPress now blocks high-risk plugin releases with a new AI-powered automated security review. Plugins remain the leading route to mass site compromise.
45. Switzerland Builds Open-Source Workplace Platform to Operate Alongside Microsoft 365
Sep 8, 2026 • gbhackers.com
Switzerland is building an open-source workplace platform to operate alongside Microsoft 365. The move reflects growing interest in digital sovereignty.
46. Jellyfin 12.0 Released With Security Fixes for Unauthorized File Access and XSS Flaws
Sep 8, 2026 • gbhackers.com
Jellyfin 12.0 was released with security fixes for unauthorized file access and XSS flaws. Self-hosted media servers are increasingly exposed to the internet.
47. ConnectWise ScreenConnect Remote Access Flaw Impacts Guest File Transfer Sessions
Sep 7, 2026 • gbhackers.com
A ConnectWise ScreenConnect remote-access flaw impacts guest file-transfer sessions. Remote-access tools are repeatedly abused by attackers.
48. New InjectEave Attack Lets Hackers Eavesdrop on Headphone Audio From 30 Meters Away
Sep 8, 2026 • gbhackers.com
A new InjectEave attack lets hackers eavesdrop on headphone audio from 30 meters away. It highlights the widening physical-side attack surface.
49. Skullcandy Dime 3 Bluetooth Flaw Lets Nearby Attackers Hijack Audio and Microphone
Sep 10, 2026 • gbhackers.com
A Skullcandy Dime 3 Bluetooth flaw lets nearby attackers hijack audio and the microphone. Consumer wireless devices remain a soft target.
50. The 12 Best Unified Endpoint Management (UEM) Solutions, Compared and Priced
Sep 10, 2026 • gbhackers.com
GBHackers compares and prices the 12 best unified endpoint management solutions. The guide helps teams choose tools to secure their device fleets.
❓ FREQUENTLY ASKED QUESTIONS
What does this weekly cybersecurity newsletter cover?
Each issue of the GBHackers cybersecurity newsletter rounds up the week’s 50 most important stories — critical vulnerabilities, ransomware attacks, data breaches, AI security threats, phishing campaigns, and malware research — curated by our editorial team from everything published on gbhackers.com.
How is a cybersecurity bulletin different from daily security news?
A cybersecurity bulletin condenses hundreds of daily headlines into a single prioritized weekly briefing. Instead of monitoring feeds all day, security teams get the exploited CVEs, active campaigns, and breaches that actually matter — with direct links to the full analysis of each story.
How do I subscribe to the GBHackers weekly cybersecurity newsletter?
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