Improper access control in Open WebUI - #VU130166
Published: May 5, 2026
Vulnerability identifier: #VU130166
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/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 access control and access restricted models.
The vulnerability exists due to improper access control in model chaining via base_model_id when handling model creation, import, and chat completion requests. A remote user can create or import a model that references a restricted base model to bypass access control and access restricted models.
Exploitation requires model creation permission and the presence of a restricted base model on the instance.
Remediation
Install security update from vendor's website.