Incorrect authorization in Open WebUI - CVE-2026-70494
Published: August 3, 2026
Vulnerability identifier: #VU140753
CSH Severity: Medium
CVSS v4: 7.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70494
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to permanently delete another user's chats and messages within a shared folder subtree.
The vulnerability exists due to incorrect authorization in the DELETE /api/v1/folders/{id} handler in backend/open_webui/routers/folders.py when handling deletion requests for shared subfolders. A remote user can send a crafted folder deletion request to permanently delete another user's chats and messages within a shared folder subtree.
The issue is exposed only when folder sharing is enabled, and the victim has granted write access to a shared folder. The inherited write grant applies to descendant subfolders, including ones not explicitly shared with the caller.
Affected software
Open WebUI
How to mitigate CVE-2026-70494
Install security update from vendor's website.
Open WebUI - update to 0.11.0