CVE-2026-45365

Open WebUI: Authenticated users can bypass model access control via exposed query parameter

State: Published
Severity: 5.4 Medium
Published: May 15, 2026
Updated: May 19, 2026
Reserved: May 12, 2026

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.11, an internal-only bypass_filter parameter is exposed on the /openai/chat/completions and /ollama/api/chat HTTP endpoints via FastAPI query string binding, allowing any authenticated user to append ?bypass_filter=true and bypass model access control checks to invoke admin-restricted models. This vulnerability is fixed in 0.8.11.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N	GitHub_M

Weaknesses

CWE-285 Improper Authorization

Affected Products

Product	Versions
open-webuiopen-webui	< 0.8.11Affected

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-v6qf-75pr-p96m

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