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XBOW chained three Chrome bugs to escape the renderer sandbox in six days

xbow.com 17 min read Editor score 9/10

XBOW combined V8, animated-WebP and Crashpad bugs into a renderer-sandbox escape, building the chain in six days through parallel campaigns. The case shows how agent-assisted security work can compress exploit development and stresses the need to evaluate browser defenses against chained attacks.

What: - XBOW’s Chrome full-chain exploit combined three bugs to turn JavaScript in a tab into code execution outside the renderer sandbox.
How: - AI agents searched code, tested hypotheses, and built exploit stages in parallel; researchers selected targets and integrated components over six days.
Why it matters: - Clean interfaces and backup routes let the team replace exploit stages independently, a modular approach relevant to building resilient security workflows.

The exploit chain crosses the V8 and renderer boundaries through three vulnerability stages. Sketched from the article's own text.

Read on xbow.com → Hacker News · 11 comments

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