Open WebUI — Vulnerability (CVE-2026-44553)
Date: 2026-05
Affected: openwebui/open_webui
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-44553
CWE: CWE-613
CVSS: 8.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, administrative role changes and user deletions do not iterate SESSION_POOL to disconnect affected sessions. As a result, a user whose admin role has been revoked retains admin privileges within their existing Socket.IO session for as long as they keep the connection alive (via automatic heartbeats). The gap is exclusive to the Socket.IO session cache. This vulnerability is fixed in 0.9.0.


Mitigations:

Architectural layers (MAESTRO):