Vulnerability · Published May 15, 2026 · Assigned by GitHub_M

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

Medium 5.4

In plain English

A medium-severity security flaw in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 91.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.8.11	GHSA-v6qf-75pr-p96m
PyPI	open-webui	0.8.11	PYSEC-2026-2758

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	< 0.8.11

Weakness: CWE-285 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

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