Apache CXF LDAP Injection Vulnerability Lets Attackers Retrieve Arbitrary Certificates
CVE-2026-44930 in Apache CXF's XKMS service allows LDAP injection, enabling attackers to extract arbitrary digital certificates from vulnerable systems.
A newly disclosed vulnerability in Apache CXF, tracked as CVE-2026-44930, is raising concerns among enterprise users relying on its XKMS (XML Key Management Specification) services. The flaw, classified as an important severity issue, affects the LDAP-based certificate repository component and could allow attackers to retrieve arbitrary digital certificates from vulnerable systems. Apache CXF is widely used for building web services and managing security components, including certificate storage and retrieval. The vulnerability was publicly disclosed on May 22, 2026, via the Apache developer mailing list, highlighting the risk posed by improper input validation in LDAP queries.
The issue resides in the XKMS LDAP certificate repository module, where insufficient sanitization of user-supplied input leads to an LDAP injection vulnerability. Attackers can exploit this weakness by crafting malicious queries that manipulate backend LDAP search filters. As a result, unauthorized users may be able to extract certificates beyond their intended scope of access. While the vulnerability does not directly enable remote code execution, it can significantly weaken trust infrastructures. Certificates retrieved through exploitation could be used for impersonation, interception of encrypted communications, or further lateral movement within enterprise environments.
The affected versions include Apache CXF 4.2.0 before 4.2.1, 4.0.0 through 4.1.5, and all versions before 3.6.11. Organizations using these versions in production environments, particularly those integrating XKMS for certificate lifecycle management, are at heightened risk. For example, an attacker interacting with a vulnerable XKMS endpoint could inject specially crafted LDAP filters into certificate lookup requests, thereby enumerating or extracting certificates belonging to other users or services within the directory.
Through the Apache developer mailing list, the Apache Software Foundation confirmed patched Apache CXF releases 4.2.1, 4.1.6, and 3.6.11 addressing the issue. These updates introduce proper input validation and secure handling of LDAP queries to prevent injection attacks. Security teams are strongly advised to upgrade immediately to the latest patched versions. In addition to patching, organizations should review their LDAP access controls, monitor certificate access logs for unusual activity, and restrict external exposure of XKMS services where possible.
This vulnerability highlights the continued risk posed by injection flaws in enterprise middleware components. Even in modern frameworks, improper handling of directory queries can expose sensitive cryptographic assets. The disclosure follows a pattern of LDAP-related vulnerabilities in enterprise software, underscoring the need for rigorous input validation in all components that interact with directory services.