What is CVE-2026-45339?

CVE-2026-45339 is a medium-severity vulnerability in Open-webui, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-05-15.

How severe is CVE-2026-45339?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Open-webui

CVE-2026-45339

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, Open WebUI allows admins to restrict which API endpoints an API key can access. When an API key is restricted from /api/v1/m…

Vulnerability class: Broken Access Control

EPSS: 0.000 (10.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.

Affected products

Open-webui — versions < 0.9.0
Openwebui Open_webui

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-45339?: CVE-2026-45339 is a medium-severity vulnerability in Open-webui, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-05-15.
How severe is CVE-2026-45339?: Medium severity. CVSS v3 base score is 6.5 out of 10.