What is CVE-2026-45397?

CVE-2026-45397 is a medium-severity vulnerability in Open-Webui, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-05-15.

How severe is CVE-2026-45397?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Open-Webui

CVE-2026-45397

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, GET /api/v1/retrieval/ returns live RAG pipeline configuration to any unauthenticated HTTP client. No Authorization header, cookie, or API key is required. Every adjacent endpoint on the same router (/embedding, /config) is correctly guarded by get_admin_user making this a targeted omission. This vulnerability is fixed in 0.9.5.

Vulnerability class: Broken Authentication

Published 2026-05-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.001

Affected products

Open-Webui — versions < 0.9.5
Openwebui Open Webui

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

github.com/open-webui/open-webui/security/advisories/GHSA-65pg-qhhw-mxwg (Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-45397?: CVE-2026-45397 is a medium-severity vulnerability in Open-Webui, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-05-15.
How severe is CVE-2026-45397?: Medium severity. CVSS v3 base score is 5.3 out of 10.