# CVE-2026-88000

## Summary

- **CVE ID:** CVE-2026-88000
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-835
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## 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.

## Affected Products

- open-webui — open-webui (>= 0.10.0, < 0.11.1)

## References

- [CNA](https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2)
- [CNA](https://github.com/open-webui/open-webui/pull/28035)
- [CNA](https://github.com/open-webui/open-webui/commit/b933292d63d12be3fd1416fe55519ddc7aa336bc)
- [CNA](https://github.com/open-webui/open-webui/releases/tag/v0.11.1)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._