CVE-2026-56400 | open-webui before 0.3.14 contains a cross-origin resource sh… | CVSS 8.3 HIGH

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.

Metadata

CVE ID: CVE-2026-56400
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-21 12:37 UTC
Published: 2026-07-15 11:25 UTC
Last updated: 2026-07-15 11:25 UTC
Primary CWE: CWE-613
Insufficient Session Expiration
Vendor / Product: open-webui / open-webui
Sources: cve.org · NVD

Severity & Metrics

8.3 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products (1)

Vendor	Product	Platform	Versions
open-webui	open-webui	—	0 < 0.3.14, 0.3.14

Weakness (CWE)

CWE	Source	Description
CWE-613	cna	Insufficient Session Expiration

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.0	CRITICAL	4.0	cna	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
8.3	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

References (2)

GitHub Security Advisory (GHSA-6xcp-7mpr-m7wm) https://github.com/open-webui/open-webui/security/advisories/GHSA-6xcp-7mpr-m7wm
VulnCheck Advisory: open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation https://www.vulncheck.com/advisories/open-webui-remote-code-execution-via-cors-misconfiguration-and-session-validation