Missing Authorization in Open WebUI - #VU130943
Published: May 11, 2026
Vulnerability identifier: #VU130943
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-862
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 invoke restricted tools and access their output.
The vulnerability exists due to missing authorization in the chat_completion API when processing user-supplied tool_ids or tool_servers parameters. A remote user can supply crafted tool identifiers to invoke restricted tools and access their output.
Requests can cause the server to use stored authentication tokens when invoking the selected tool.
Remediation
Install security update from vendor's website.