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Malicious Twitch chat messages can trigger code execution on OBS Studio

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A chain of flaws lets a malicious Twitch chat message turn into native code execution on a streamer’s Windows PC when OBS Studio 32.2.2 or older is used with default settings. A custom Twitch chat overlay inserted viewer messages as unsanitized HTML, creating an XSS vector that allowed attacker-controlled JavaScript to run inside OBS’s embedded Chromium renderer (CEF). Because OBS bundled an outdated Chromium (127) with a known V8 type-confusion vulnerability (CVE-2024-7971) and had the Chromium sandbox disabled, JavaScript exploitation of V8 escalated directly to native code execution without requiring a separate sandbox escape. Orange reproduced the full chain, developed a proof-of-concept exploit, coordinated with the overlay developer, and reported the issue to OBS.

OBS is upgrading its embedded browser to CEF/Chromium 128+ and testing re-enabling the Chromium sandbox; fixes were merged into obs-browser and obs-studio in September. Until updated builds are widely available, streamers and overlay developers must treat Browser Source content as untrusted: insert viewer messages as plain text, sanitize any HTML, and avoid loading attacker-controlled pages into Browser Sources or docks. The CVE is known to have been exploited in the wild and appears in CISA’s catalog, making prompt remediation and cautious configuration essential.

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