Improper access control in Open WebUI - CVE-2026-44563
Published: May 5, 2026
Vulnerability identifier: #VU130172
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-44563
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to bypass model access controls and access restricted model information and compute resources.
The vulnerability exists due to improper access control in the Ollama proxy endpoints in backend/open_webui/routers/ollama.py when handling direct requests to /api/generate, /api/embed, /api/embeddings, and /api/show. A remote user can send requests with a restricted model name to bypass model access controls and access restricted model information and compute resources.
Exploitation requires Ollama to be configured as a backend, model access control to be enabled, and knowledge of the restricted model name.
Affected software
Open WebUI
How to mitigate CVE-2026-44563
Install security update from vendor's website.
Open WebUI - update to 0.9.0