Vulnerability · Published May 15, 2026 · Assigned by GitHub_M

CVE-2026-45349Open WebUI: Broken Access Control for Completions API

High 7.1

In plain English

A high-severity authorization bypass via user-controlled key 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 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.2%top 85.9% 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 0.9.0, a user just needs to use the API endpoint: /api/chat/completions with their own API key (generated in OWUI) and the Chat ID of another user to continue the conversation of the other user. This vulnerability is fixed in 0.9.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.9.0	GHSA-gfm2-xm6c-37qc
PyPI	open-webui	0.9.0	PYSEC-2026-2726

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	< 0.9.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-gfm2-xm6c-37qc x_refsource_CONFIRM