CVE-2026-109296

Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes

State: Published
Severity: 5.3 Medium
Published: Oct 12, 2026
Updated: Oct 23, 2026
Reserved: Oct 12, 2026

Description

Open WebUI before 0.11.4 contains a missing authorization vulnerability that allows authenticated users to reach disabled model provider backends by supplying an explicit backend index. Attackers can pass the index as a path segment or query parameter on Ollama and OpenAI-compatible listing routes to trigger requests carrying configured API keys, read version strings, and enumerate connections.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	VulnCheck

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key
CWE-862 Missing Authorization

Affected Products

Product	Versions
open-webuiopen-webui	before 0.11.4Affected 0.11.4Not affected

References

GitHub Security Advisory (GHSA-hm62-64q2-6gxw)vendor-advisory
VulnCheck Advisory: Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routesthird-party-advisory

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