LDAP Authentication Vulnerability in Open WebUI by Open WebUI
CVE-2026-44551

9.1CRITICAL

Key Information:

Vendor

Open-webui

Status
Open-webui
Vendor
CVE Published:
15 May 2026

What is CVE-2026-44551?

An improper authentication vulnerability exists in the Open WebUI platform prior to version 0.9.0, specifically within the LDAP authentication endpoint. This vulnerability allows attackers to bypass the login mechanism due to insufficient validation of password fields, enabling them to authenticate with an empty password. As a result, the vulnerable application can successfully bind to LDAP servers, issuing valid session tokens for unauthorized users, thus compromising user accounts. The issue has been 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:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.