CVEvulnerability

CVE-2026-87994

4.3 MEDIUM Published 2026-09-09 Modified 2026-09-16 Official page ↗
Status
Analyzed
Published
2026-09-09
Last modified
2026-09-16
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weaknesses
CWE-639, CWE-862

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.

Affected configurations

• openwebui open webui (>= 0.9.5 < 0.11.1)

Related

Weakness · CWE (2)

  • CWE-639 Authorization Bypass Through User-Controlled Key weakness
  • CWE-862 Missing Authorization weakness

References