CVE-2026-45365CWE-285

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

Medium · published May 15, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
17.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00267 · 17.8th percentile
Weakness
CWE-285 · Improper Authorization
Published
2026-05-15T21:07Z
EPSS history
Timeline
  • 15 MAY 21:07Z
    Open WebUI: Authenticated users can bypass model access control via exposed query parameter
    cvelistv5