CVE-2026-45301: Open WebUI: Missing permission check in files API allows authenticated users to list, access and delete every uploaded file

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-15 · updated 2026-06-17
Weakness: CWE-284

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.3.16, a missing permission check in all files related API endpoints allows any authenticated user to list, access and delete every file uploaded by every user to the platform. This vulnerability is fixed in 0.3.16.

Affected products

open-webui: before 0.3.16 — fixed in 0.3.16

How to fix

Upgrade to a fixed version: open-webui 0.3.16. Check the vendor advisory for mitigations.

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-r8wh-8m7r-fh33
https://github.com/open-webui/open-webui/security/advisories/GHSA-r8wh-8m7r-fh33

Get alerted when CVE-2026-45301 or the next vulnerability affects your stack