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Wednesday, 28 October 2026
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Incident database

Open WebUI vulnerabilities allow DoS and message tampering

Three vulnerabilities in Open WebUI allow authenticated users to hang the server via cyclic chat structures and channel members to overwrite other users' messages. Versions 0.5.0-0.11.0 are affected; fixes are available in 0.11.1.

Disclosed 9 September 2026 · Record updated 1 October 2026

Impact

Server denial of service via infinite loops in chat history processing, and message integrity compromise in channels. No data disclosure.

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Sources

  1. github.comhttps://github.com/advisories/GHSA-jqhh-cjmq-vmv6
  2. github.comhttps://github.com/advisories/GHSA-3cgp-3cqx-j8w2
  3. github.comhttps://github.com/advisories/GHSA-fmqh-xp37-5hr8