CVE-2026-88000
Medium
Description
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductOpenwebui Open Webui
PublishedSep 9, 2026
First seenSep 9, 2026
Weakness typeCWE-835CWE-835
How to fix
Update
- openwebui open_webui0.11.1 or later
- open-webui0.11.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| openwebui open_webui | 0.10.0 ≤ v < 0.11.1 | 0.11.1 |
| open-webuiPyPI | 0.10.0 ≤ v < 0.11.1 | 0.11.1 |
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