CVE-2026-45365
MEDIUMOpen WebUI: Authenticated users can bypass model access control via exposed query parameter
Title source: cnaDescription
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.
References (1)
Core 1
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/open-webui/open-webui/security/advisories/GHSA-v6qf-75pr-p96m
Scores
CVSS v3
5.4
EPSS
0.0003
EPSS Percentile
8.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-285
Status
published
Products (3)
open-webui/open-webui
< 0.8.11
openwebui/open_webui
< 0.8.11
pypi/open-webui
0 - 0.8.11PyPI
Published
May 15, 2026
Tracked Since
May 16, 2026