Improper access control in Open WebUI - CVE-2026-44555
Published: May 5, 2026
Vulnerability identifier: #VU130166
CSH Severity: Low
CVSS v4: 7.2 [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]
CVE-ID: CVE-2026-44555
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Open WebUI
How to mitigate CVE-2026-44555
Install security update from vendor's website.
Open WebUI - update to 0.9.0