CVE-2026-45365 MEDIUM

CVE-2026-45365: Open WebUI: Authenticated users can bypass model access control via exposed query parameter

Vendor Open-Webui
Product open-webui
Weakness CWE-285
Published May 15, 2026
Last update May 19, 2026
View on NVD All CVEs

CVSS base score

5.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 15, 2026 CVE published
May 19, 2026 Record updated