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This article details the "BragJack" vulnerability, where malicious browser extensions hijack AI agents by exploiting trusted communication channels rather than bypassing model guardrails. The attack demonstrates a critical architectural flaw in how browsers connect external AI interfaces to privileged internal components, allowing unauthorized command injection before safety filters can intervene. This represents a significant security risk for the deployment of AI assistants across major Chromium-based environments.
BragJack Attack Lets Malicious Extensions Hijack AI Agents Across 5 Major Browsers
A new attack technique dubbed “BragJack” allows a malicious browser extension to seize trusted communication channels used by AI assistants in Chrome, Edge, Opera Neon, Comet, and Claude in Chrome. Rather than bypassing model guardrails or hiding instructions inside web content, the proof-of-concept attacks directly supplied commands to privileged browser components, turning an assistant into […] The post BragJack Attack Lets Malicious Extensions Hijack AI Agents Across 5 Major Browsers appeared first on Cyber Security News.
A new attack technique dubbed “BragJack” allows a malicious browser extension to seize trusted communication channels used by AI assistants in Chrome, Edge, Opera Neon, Comet, and Claude in Chrome. Rather than bypassing model guardrails or hiding instructions inside web content, the proof-of-concept attacks directly supplied commands to privileged browser components, turning an assistant into a tool for theft and unauthorized actions. Forever Security researcher Gal Weizman demonstrated the technique across…
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