What is CVE-2026-45400?

CVE-2026-45400 is a high-severity vulnerability in Open-Webui, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-05-15.

How severe is CVE-2026-45400?

High severity. CVSS v3 base score is 8.5 out of 10.

SSRF in Open-Webui

CVE-2026-45400

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, a parsing difference between the urlparse and requests libraries led to an SSRF bypass vulnerability. This vulnerability is fixed in 0.9.5.

Vulnerability class: SSRF (Server-Side Request Forgery)

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

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (24.4th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Open-Webui — versions < 0.9.5
Openwebui Open Webui

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

github.com/open-webui/open-webui/security/advisories/GHSA-8w7q-q5jp-jvgx (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-45400?: CVE-2026-45400 is a high-severity vulnerability in Open-Webui, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-05-15.
How severe is CVE-2026-45400?: High severity. CVSS v3 base score is 8.5 out of 10.