CVE-2026-88000

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, DELETE /api/v1/chats/{id}/messages/{message_id} used the chat-history deletion helper in backend/open_webui/models/chats.py to follow childrenIds without recording visited message identifiers. An authenticated user could store a cyclic chat tree and delete a message, causing a synchronous infinite loop on the server request loop that blocked every user's requests until the process was killed. This issue is fixed in version 0.11.1.

• CWE-835

• https://github.com/open-webui/open-webui/commit/b933292d63d12be3fd1416fe55519ddc7aa336bcPatch
• https://github.com/open-webui/open-webui/pull/28035Exploit, Patch
• https://github.com/open-webui/open-webui/releases/tag/v0.11.1Release Notes
• https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2Exploit, Vendor Advisory
• https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2Exploit, Vendor Advisory

Published

Sep 9, 2026

Last Modified

Sep 14, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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