A Single Browser Extension Can Hijack Five AI Agents, Researchers Warn

The 'BragJack' disclosure shows a browser extension commandeering five separate AI agents at once — the latest evidence that agentic systems have a trust-boundary problem.

A browser extension can hijack five AI agents simultaneously through a technique dubbed "BragJack," according to @FadyEid. The attack sits in the same family as the "Plugin4Shell" class of issues that has been dogging agentic systems: the moment you give an agent the ability to read a page, interact with a browser, or call a plugin, you have created a channel through which a hostile actor can inject instructions the agent will faithfully obey.

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia curae.

Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Proin pharetra nonummy pede. Mauris et orci. Aenean nec lorem. In porttitor. Donec laoreet nonummy augue. Suspendisse dui purus, scelerisque at, vulputate vitae, pretium mattis, nunc. Mauris eget neque at sem venenatis eleifend. Ut nonummy. Fusce aliquet pede non pede. Suspendisse dapibus lorem pellentesque magna integer malesuada.

Unlock the full briefing

Get every story in today's briefing, the full archive, and the daily AI intelligence brief.

All stories today

Full archive

Daily brief