# Malicious Extensions Exploit AI Browser Agents > Source: > Published: 2026-09-19 15:03:09+00:00 Imagine a single malicious browser extension handing an AI-powered browser agent a set of instructions, allowing it to act with the browser's existing privileges - and putting your entire online presence at risk. Security researcher Gal Weizman has uncovered this vulnerability with his proof-of-concept, BragJack, which can hijack AI assistants embedded in popular Chromium-based browsers.