CVE-2026-109296 Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes
Authenticated users can bypass authorization to access disabled model backends, exposing API keys and connection details in Open WebUI.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109296?
CVE-2026-109296 is a medium-severity missing authorization vulnerability in open-webui, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Which versions are affected by CVE-2026-109296?
How do I fix CVE-2026-109296?
No fix has been published for CVE-2026-109296 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-109296 being exploited?
There is no known exploitation of CVE-2026-109296 in the wild and no public exploit code.
Sources
Also known as GHSA-32hx-qqmp-8j8q, GHSA-hm62-64q2-6gxw.