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First seenSep 21, 2026
Last mentionedSep 21, 2026

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ChatGPT Ad Tracking Cookie Follows Users Across Third-Party Advertiser Websites

OpenAI’s __obi cross-site cookie links ChatGPT account activity to third-party advertiser websites, collecting personal data including conversion events and device-linked identifiers.

Cyber Security NewsSep 21, 13:02 UTC · Sep 21, 2026Phishing & fraud1 · 1 read

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OpenAIproduct · 1
ChatGPTproduct · 1
OpenAIorganization · 1
ChatGPTai model · 1
__obimalware · 1
Ad platformsvendor · 1

Entities are extracted by the model from each article. First seen Sep 21, 2026, last mentioned Sep 21, 2026. Watching keeps it in this browser only (no account); the watchlist page and dashboard alerts use it.