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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/open-webui/open-webui/commit/b933292d63d12be3fd1416fe55519dd…
security-advisories@github.com
https://github.com/open-webui/open-webui/pull/28035
security-advisories@github.com
https://github.com/open-webui/open-webui/releases/tag/v0.11.1
security-advisories@github.com
https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2
security-advisories@github.com