CVE-2026-44553

Open WebUI: Stale Admin Role in Socket.IO Session Pool Enables Post-Demotion Cross-User Note Access

State: Published
Severity: 8.1 High
Published: May 15, 2026
Updated: May 19, 2026
Reserved: May 6, 2026

Description

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 As a result, a user whose admin role has been revoked retains admin privileges within their existing Socket.IO session for as long as they keep the connection alive (via automatic heartbeats).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.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-613 Insufficient Session Expiration

Affected Products

Product	Versions
open-webuiopen-webui	< 0.9.0Affected

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-45m8-cpm2-3v65

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