Improper Access Control in Open WebUI Affects Self-Hosted AI Platforms
CVE-2026-44558

5.4MEDIUM

Key Information:

Vendor

Open-webui

Status
Open-webui
Vendor
CVE Published:
15 May 2026

What is CVE-2026-44558?

Open WebUI, a self-hosted AI platform, has a vulnerability that allows a non-admin user to bypass administrative permissions when creating or updating channel grants. Specifically, prior to version 0.9.0, the channel router does not implement the necessary access control checks on the create or update paths, enabling unauthorized access grants to be submitted and stored without proper validation. This could lead to unintended access to resources and data by unauthorized users, highlighting the importance of keeping software updated to mitigate such security risks.

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

.