
How a Malicious Twitch Extension Stole 30,000 Users' OAuth Tokens
In September 2026, security researchers discovered that the 'Twitch Enhanced Viewer | JeetBot' browser extension, installed by over 30,000 users across Chrome and Firefox stores, was secretly harvesting users' OAuth authentication tokens. The extension, marketed as a legitimate Twitch enhancement tool for ad-blocking and quality improvements, redirected users' streaming requests through Russian-operated proxy servers while embedding authentication credentials in URL parameters, making them easily accessible in server logs. This supply-chain attack demonstrates the persistent risk of malicious browser extensions infiltrating official app stores despite security reviews. This incident highlights the growing trend of credential theft through seemingly legitimate browser extensions, coinciding with increased regulatory scrutiny of third-party software supply chains and the need for enhanced OAuth token security practices.
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