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Once in a BlueMoon: How a Chrome Patch-Gap Turned Three V8 Zero-Days Into an Espionage Kit
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Fusion42 · 12 September 2026 · Fusion42 review
A chain of three medium-severity Chrome V8 vulnerabilities was exploited during the patch-gap window to achieve SYSTEM-level access, rapidly adopted by four espionage groups mainly linked to China. The exploit kit highlights new risks for browser-based AI agents sharing the Chromium V8 engine, signalling a growing structural threat from open-source patch transparency.
This Wire brief sits within Fusion42's coverage of Cybersecurity.
◆ ◆ The Wire takeaway
Browser exploit risks now extend into AI agents running inside Chromium, creating a direct pathway for attackers to hijack AI capabilities. If you rely on web-based AI tools, fixing exposure to V8 exploits should be your immediate priority.
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1 source · 12 Sep 2026
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