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CVE-2026-88000

Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic chat tree

CVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-88000

Published

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.

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23 Oct 2026 15:48:27 UTC

Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic chat tree

cve-program · CVE-2026-88000 · Published

ChangeIntel

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Sources read 15 Nov 01:41 UTC · 255 of 275 readable · 253 fully read · documentation 469/469 current

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