Missing Authorization in Open WebUI - #VU140754
Published: August 3, 2026
Vulnerability identifier: #VU140754
CSH Severity: Low
CVSS v4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to missing authorization in delete_chat_by_id when handling DELETE /api/v1/chats/{id} requests. A remote user can send a delete request for another user's chat to cause a denial of service.
The issue affects cancellation of in-flight chat tasks before authorization is checked, and exploitation requires knowledge of the target chat id while a generation is running.
Affected software
Open WebUI
Remediation
Install security update from vendor's website.
Open WebUI - update to 0.11.0