A shared ChatGPT link could run attacker code inside your signed-in session
AspireAI community · Parameter
*A shared ChatGPT link could run attacker code inside your signed-in session, and OpenAI rated it P1.*
Parameter researchers turned a normal shared conversation into a sandbox escape. The HTML Preview ran on a separate origin, but an interactive graph in the same chat loaded MathLive into the main page, and MathLive's keyboard listener accepted a postMessage from any origin and fed the payload into innerHTML. An unsandboxed srcdoc frame inherited the chatgpt.com identity, and a YouTube oEmbed JSONP callback slipped past the CSP. The result: attacker JavaScript could list conversations, open a private chat, and send it off.
The honest limit: OpenAI fixed it on October 26, and Parameter reports no real-world exploitation, running its proof between separate accounts.
https://www.parameter.ai/labs/we-found-a-gap-at-openai
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