{"slug": "malicious-ad-blocker-extensions-exfiltrate-ai-chat-data", "title": "Malicious Ad-blocker Extensions Exfiltrate AI Chat Data", "summary": "Security researchers at MalExt Sentry uncovered a campaign called 'PromptSnatcher' on June 13, 2026, in which two malicious ad-blocker extensions, 'Smart Adblocker' and 'Adblock for Browser,' exfiltrated AI chat data from approximately 90,000 users. The extensions captured conversations from eight AI platforms including ChatGPT, Gemini, and Claude, sending prompts and responses to developer servers via an internal engine called 'Panel 231.'", "body_md": "Editorial analysis: For practitioners, browser-side extensions with broad page access create a straightforward vector for sensitive prompt and response leakage, changing threat models for prompt engineering and data governance. Notebookcheck reports that security researchers at MalExt Sentry uncovered a campaign they call \"PromptSnatcher\" on June 13, 2026, in which two extensions posing as ad blockers - \"Smart Adblocker\" (extension ID iojpcjjdfhlcbgjnpngcmaojmlokmeii, about **80,000** users) and \"Adblock for Browser\" (ID jcbjcocinigpbgfpnhlpagidbmlngnnn, about **10,000** users) - quietly recorded conversations from roughly **90,000** users. Notebookcheck writes that the extensions captured chats from eight AI platforms, including `ChatGPT`, `Gemini`, and `Claude`, storing up to **10,000** characters of prompts and **30,000** characters of responses and sending the data to developer servers via an internal engine the researchers call `Panel 231`.", "url": "https://wpnews.pro/news/malicious-ad-blocker-extensions-exfiltrate-ai-chat-data", "canonical_source": "https://letsdatascience.com/news/malicious-ad-blocker-extensions-exfiltrate-ai-chat-data-8ab72a28", "published_at": "2026-06-30 10:49:00+00:00", "updated_at": "2026-06-30 11:56:20.413846+00:00", "lang": "en", "topics": ["ai-safety", "ai-policy", "ai-ethics"], "entities": ["MalExt Sentry", "Smart Adblocker", "Adblock for Browser", "ChatGPT", "Gemini", "Claude", "Panel 231", "Notebookcheck"], "alternates": {"html": "https://wpnews.pro/news/malicious-ad-blocker-extensions-exfiltrate-ai-chat-data", "markdown": "https://wpnews.pro/news/malicious-ad-blocker-extensions-exfiltrate-ai-chat-data.md", "text": "https://wpnews.pro/news/malicious-ad-blocker-extensions-exfiltrate-ai-chat-data.txt", "jsonld": "https://wpnews.pro/news/malicious-ad-blocker-extensions-exfiltrate-ai-chat-data.jsonld"}}