Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openwebui | Open Webui | < 0.9.0 |
Related Weaknesses (CWE)
References
- https://github.com/open-webui/open-webui/security/advisories/GHSA-hmgr-67hw-j2cqExploitMitigationVendor Advisory
- https://github.com/open-webui/open-webui/security/advisories/GHSA-hmgr-67hw-j2cqExploitMitigationVendor Advisory
FAQ
What is CVE-2026-44561?
CVE-2026-44561 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 doe...
How severe is CVE-2026-44561?
CVE-2026-44561 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-44561?
Check the references section above for vendor advisories and patch information. Affected products include: Openwebui Open Webui.