CVE-2026-44551

Open WebUI: LDAP Empty Password Authentication Bypass

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the LDAP authentication endpoint does not validate that the submitted password is non-empty before performing a Simple Bind against the LDAP server. The LdapForm Pydantic model accepts password: str with no minimum length constraint, so an empty string passes validation. The subsequent Connection.bind() call succeeds on vulnerable LDAP servers, and the application issues a full session token for the target user. This vulnerability is fixed in 0.9.0.

Affected

open-webui

CVSS v3.1 GITHUB

9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS

1.63% chance of exploitation in the next 30 days, 76th percentile

Nuclei

critical · CWE-287

Published

2026-05-15

Updated

2026-05-19

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-44551.yaml

Security advisories

• open-webui/open-webui/security/advisories/GHSA-2r4p-jpmg-48f4
• advisories/GHSA-2r4p-jpmg-48f4

References

• CVE Record
• NVD entry