CVE-2026-87994

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.5 until 0.11.1, the channel branch of chat_completion in backend/open_webui/main.py checked channel write access and channel membership for a supplied message_id but did not verify that the calling user authored the targeted message. A channel member could use the chat completions endpoint to replace another member's message while preserving the victim as the stored author, altering the conversation record without gaining access to other channels. This issue is fixed in version 0.11.1.

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Produits concernés

• open-webui
• Openwebui open webui

Scores CVSS

Faiblesses (CWE)

• CWE-639
• CWE-862

Références

• https://github.com/open-webui/open-webui/commit/7d392bedc9c1aaecc94509a58e59186b614433dc Patch
• https://github.com/open-webui/open-webui/pull/28631 Issue TrackingPatch
• https://github.com/open-webui/open-webui/releases/tag/v0.11.1 Release Notes
• https://github.com/open-webui/open-webui/security/advisories/GHSA-fmqh-xp37-5hr8 ExploitVendor Advisory
• https://github.com/open-webui/open-webui/security/advisories/GHSA-fmqh-xp37-5hr8 ExploitVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories