Improper access control in Open WebUI - #VU136846
Published: July 3, 2026
Vulnerability identifier: #VU136846
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/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 disclose sensitive information.
The vulnerability exists due to improper access control in get_all_models handlers in routers/openai.py and routers/ollama.py when caching permission-filtered model lists. A remote user can request the model list within the cache ttl window to disclose sensitive information.
The exposure is timing-dependent and limited to the most recently cached permission-filtered model list, and the attacker cannot choose which other user's list is returned.
Remediation
Install security update from vendor's website.