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.
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History
Fri, 15 May 2026 21:45:00 +0000
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| Description | 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. | |
| Title | Open WebUI: Deactivated Channel Members Retain Full Access to Group/DM Channels | |
| Weaknesses | CWE-863 | |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-05-15T19:34:52.060Z
Updated: 2026-05-15T20:22:00.557Z
Reserved: 2026-05-06T20:59:00.595Z
Link: CVE-2026-44561
Updated: 2026-05-15T20:21:57.244Z
Status : Received
Published: 2026-05-15T20:16:47.743
Modified: 2026-05-15T21:16:36.170
Link: CVE-2026-44561
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