Improper access control in Open WebUI - #VU130172
Published: May 5, 2026
Vulnerability identifier: #VU130172
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Open WebUI
Affected software:
Open WebUI
Open WebUI
Detailed vulnerability description
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.
Remediation
Install security update from vendor's website.