Apache CXF Flaw Exposes Systems to LDAP Injection Attacks

Apache CXF users are facing a significant security risk following the disclosure of a new vulnerability that exposes systems to LDAP injection attacks, potentially allowing unauthorized access to sensitive certificate data.

The issue, tracked as CVE-2026-44930, has been classified as “important” and affects the LDAP certificate repository within the XKMS (XML Key Management Specification) service of Apache CXF.

Apache CXF Flaw Exposes Systems

The vulnerability exists in the cxf-services-xkms-x509-repo-ldap component, which manages X.509 certificates via LDAP directories. Due to improper input validation, attackers can manipulate LDAP queries by injecting malicious input.

This allows them to alter the logic of backend queries and retrieve arbitrary certificates from the repository, bypassing intended access controls. Such exposure can compromise trust relationships in systems that rely on certificate-based authentication and encryption.

The flaw impacts multiple Apache CXF versions, including 4.2.0 before 4.2.1, 4.0.0 before 4.1.6, and all versions before 3.6.11. Apache has addressed the issue in patched releases 4.2.1, 4.1.6, and 3.6.11.

Users running affected versions are strongly urged to upgrade immediately, as unpatched systems remain vulnerable to exploitation.

LDAP injection vulnerabilities occur when applications fail to properly sanitize user-supplied input before incorporating it into LDAP queries.

In this case, an attacker could craft a malicious query filter such as (|(cn=*))(|(cn=*)), which forces the system to return all available certificate entries instead of a restricted set.

This could expose sensitive cryptographic material, potentially enabling further attacks such as impersonation or unauthorized access to secure systems, as reported by Apache.

To mitigate the risk, organizations should prioritize upgrading to the latest, patched versions and reviewing their LDAP query-handling mechanisms.

Implementing strict input validation, enforcing least-privilege access controls, and monitoring LDAP query logs for unusual activity are critical defensive measures.

Additionally, deploying security controls such as web application firewalls or input filtering solutions can help detect and block injection attempts.

The vulnerability was disclosed through the Apache CXF developer mailing list, with further technical details available via the official Apache CXF website and the CVE record.

This incident highlights the ongoing risk posed by injection vulnerabilities. It reinforces the importance of secure coding practices, particularly when interacting with directory services in enterprise environments.

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