Authorization Bypass in Open WebUI AI Platform
CVE-2026-44561

5.4MEDIUM

Key Information:

Vendor

Open-webui

Status
Open-webui
Vendor
CVE Published:
15 May 2026

What is CVE-2026-44561?

The Open WebUI platform, designed for offline AI operations, contains a vulnerability in the is_user_channel_member function. Prior to version 0.9.0, this function improperly validates the membership status of users. Specifically, when a user is deactivated from a group or direct message channel, the membership record remains, resulting in an is_active field set to false while still allowing unauthorized access via API calls. This oversight enables deactivated users to retain full read and write permissions in channels, posing a significant security risk. The issue was addressed in version 0.9.0.

Affected Version(s)

open-webui < 0.9.0

References

https://github.com/open-webui/open-webui/security/advisor...
x_refsource_CONFIRM

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.