Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck

CVE-2026-109296Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes

Medium 4.3

In plain English

A medium-severity authorization bypass via user-controlled key in open-webui from open-webui. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 72.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	0 – before 0.11.4

Weakness: CWE-639, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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 Routes third-party-advisory