Vulnerability · Published Jul 15, 2026 · Assigned by VulnCheck

CVE-2026-56400open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation

High 8.3

In plain English

A high-severity security flaw in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.3High

Exploit odds (30 days)0.5%top 55.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.3.33	GHSA-6xcp-7mpr-m7wm

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	0 – before 0.3.14

Weakness: CWE-613 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-6xcp-7mpr-m7wm) vendor-advisory
VulnCheck Advisory: open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation third-party-advisory