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[LT-05] After the 900K-User Malicious Extension...

[LT-05] In January 2026, two malicious Chrome extensions installed by 900K+ users exfiltrated complete ChatGPT and DeepSeek conversations every 30...

April 16, 20268 min skaityti
malicious Chrome extensionAI extension security auditextension trust verificationlocal processing architecture900K extension incident

[LT-05]

The January 2026 Incident

Two Chrome extensions discovered in January 2026 — "Chat GPT for Chrome with GPT-5, Claude Sonnet and DeepSeek AI" (600,000+ users) and "AI Sidebar with Deepseek, ChatGPT, Claude and more" (300,000+ users) — were found to be exfiltrating complete AI conversation histories every 30 minutes to a remote command-and-control server.

The extensions presented themselves as privacy and AI enhancement tools. Their Chrome Web Store descriptions emphasized user data protecti...

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