BragJack Attacks Hijack AI Browser Agents Through Malicious Extensions

BragJack attacks hijack AI browser agents through malicious extensions

BragJack, a proof-of-concept attack from Forever Security's Gal Weizman, hijacks the AI assistants in Chrome, Edge, Opera Neon, Perplexity Comet, and Claude in Chrome using one malicious extension. The Prompt Forcing technique earned over $20,000 in bounties and two CVEs.

BragJack: How a Browser Extension Can Hijack AI Agents

A new attack called BragJack shows how a single malicious extension can hijack AI assistants in Chrome, Edge, Comet, and more — no malware required.

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 […]