Vulnerability in Open-Webui
CVE-2026-56400
open-webui before 0.3.14 contains a cross-origin resource sharing misconfiguration allowing arbitrary origins with allow_origins=* and authenticated requests to the /api/v1/functions endpoint. Attackers can execute arbitrary code on the openwebui instance by crafting malicious cross-site requests from attacker-controlled websites when an admin user visits them.
EPSS: 0.005 (41.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.
Affected products
- Open-webui — versions 0, 0.3.14
- Openwebui Open_webui
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory, Vendor Advisory)
- disclosure@vulncheck.com (Exploit, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-56400?
- CVE-2026-56400 is a high-severity vulnerability in Open-Webui, classified under Insufficient Session Expiration. CVSS score: 8.3/10. Published 2026-07-15.
- How severe is CVE-2026-56400?
- High severity. CVSS v3 base score is 8.3 out of 10.