CVE-2026-45345: Open WebUI: Missing authorization check at the model update function - models from other users can be updated

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-15 · updated 2026-06-17
Weakness: CWE-285

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.5.7, a user can modify another user's model even if its visibility is set to Private. By changing the access permissions during editing, unauthorized access can be gained. This vulnerability is fixed in 0.5.7.

Affected products

open-webui: before 0.5.7 — fixed in 0.5.7

How to fix

Upgrade to a fixed version: open-webui 0.5.7. Check the vendor advisory for mitigations.

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-gm54-m39w-grjp
https://github.com/open-webui/open-webui/security/advisories/GHSA-gm54-m39w-grjp

Get alerted when CVE-2026-45345 or the next vulnerability affects your stack