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Vulnerabilities CVE-2026-56400

CVE-2026-56400

Critical
Open
TLP:CLEAR

open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation

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Description

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.

Details

CVSS Score
9.0
EPSS Score
0.35%

27.7th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Confidence
90%
Published
Jul 15, 2026
Last Modified
Jul 15, 2026
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