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securitySaturday, October 31, 2026 at 07:28 AM
Parameter Discloses ChatGPT Share-Link Sandbox Escape via MathLive postMessage and YouTube CSP

Parameter Discloses ChatGPT Share-Link Sandbox Escape via MathLive postMessage and YouTube CSP

A share-link sandbox escape granted session-level access to private ChatGPT data through an unvalidated MathLive postMessage channel and YouTube CSP allowance. OpenAI shipped a P1 fix eight days after disclosure. The incident reveals recurring isolation failures when third-party libraries and preview renders share an authenticated origin.

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OpenAI has stated it will review additional message-passing surfaces across its web clients. Independent researchers should monitor for regressions once new interactive elements are added to shared chats.

⚡ Prediction

OpenAI: No additional origin-validation bypasses affecting shared chat previews reported through 31 March 2027

Sources (3)

  • [1]
    Parameter Security Technical Writeup(https://parameter.security/chatgpt-share-link-escape)
  • [2]
    The Hacker News Coverage(https://thehackernews.com/2026/10/a-shared-chatgpt-link-could-run.html)
  • [3]
    OpenAI Bug Bounty Resolution Note(https://openai.com/security-updates/2026-10)