Missing Authorization in Open WebUI - CVE-2026-45395
Published: May 11, 2026
Vulnerability identifier: #VU130950
CSH Severity: Low
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-45395
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to missing authorization in the tool update endpoint when processing update requests for tool content. A remote privileged user can send a specially crafted update request to execute arbitrary code.
Exploitation requires write access to an existing tool, and the issue bypasses the intended workspace.tools permission boundary for server-side code execution.
Affected software
Open WebUI
How to mitigate CVE-2026-45395
Install security update from vendor's website.
Open WebUI - update to 0.9.5