CVE-2026-44616: Apache Zeppelin: LDAP injection in ActiveDirectoryGroupRealm filter construction

[Jongyoul Lee <jongyoul () apache org>]

Severity: moderate 

Affected versions:

- Apache Zeppelin 0.6.0 before 0.12.1

Description:

LDAP injection vulnerability in Apache Zeppelin. ActiveDirectoryGroupRealm constructed LDAP search filters without 
escaping user-controlled input, allowing an authenticated attacker to inject LDAP filter syntax through the user-search 
endpoint and potentially expose directory information. The role-lookup path was also affected after successful LDAP 
authentication. This issue affects Apache Zeppelin versions 0.6.0 through 0.12.0. Users are recommended to upgrade to 
version 0.12.1, which fixes this issue.

Credit:

Andrea Cosentino from Apache Software Foundation (finder)

References:

https://github.com/apache/zeppelin/pull/5226
https://zeppelin.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-44616