Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-44561

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the is_user_channel_member function checks whether a ChannelMember row exists but does not check the is_active field. When a user is deactivated from a group or DM channel (removed by the channel owner, or leaves voluntarily), their membership row persists with is_active=False and status='left'. Because the authorization check ignores this field, the deactivated user retains full read and write access to the channel via direct API calls. This vulnerability is fixed in 0.9.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 10.5%
CVSS Severity
CVSS v3 Score 5.4
Products affected by CVE-2026-44561


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