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BragJack Hijacks AI Browser Agents via Malicious Extensions

BragJack Hijacks AI Browser Agents via Malicious Extensions

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 8.5 BleepingComputer

Security researcher Gal Weizman has disclosed BragJack, a browser extension-based attack technique capable of hijacking AI assistants embedded in Chromium browsers — including Chrome's Gemini Live, Perplexity Comet, Microsoft Edge, Opera Neon, and Anthropic's Claude. By exploiting Chromium's declarativeNetRequest API to weaken security headers and redirect JavaScript resources, a malicious extension can execute code inside privileged AI contexts without any user interaction. The attack has real-world consequence: compromised AI agents could read local files, exfiltrate data, or act on behalf of victims using existing browser-level privileges.

Microsoft Uses AI to Ship Record 974-Vulnerability Patch Batch

Microsoft Uses AI to Ship Record 974-Vulnerability Patch Batch

FIRST LOOK ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 6.2 Krebs on Security

Microsoft's September 2026 Patch Tuesday delivers 974 fixes in a single release, explicitly crediting AI-assisted vulnerability discovery for the accelerated pace and volume of findings. This represents a meaningful defensive advance: AI is now closing the gap between vulnerability existence and vendor awareness, surfacing flaws faster than traditional research cycles allowed. The residual challenge is on the defender side — patch testing, prioritisation, and deployment capacity have not scaled at the same rate as AI-accelerated discovery, creating an operational backlog risk that organisations must actively manage.

FuzzingBrain V2 Discovers 29 Zero-Day Vulnerabilities

FuzzingBrain V2 Discovers 29 Zero-Day Vulnerabilities

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 7.8 HN AI Security

Researchers have developed FuzzingBrain V2, a multi-agent LLM system capable of autonomously discovering and reproducing software vulnerabilities with a 90% detection rate on a competitive benchmark dataset. The system discovered 29 zero-day vulnerabilities across 12 open-source projects, all confirmed by maintainers, raising both defensive and dual-use concerns for the security community. While positioned as a defensive research tool, the automation of end-to-end vulnerability discovery at this scale represents a meaningful shift in the offensive capability landscape.

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