Apache Jena Vulnerabilities Enables Arbitrary File Access and Manipulation

Two critical security vulnerabilities have been disclosed in Apache Jena, the popular open-source framework for building semantic web applications, that could allow administrative users to manipulate files outside designated server directories.

The vulnerabilities, tracked as CVE-2025-49656 and CVE-2025-50151, affect all versions of Apache Jena up to and including version 5.4.0, prompting immediate security updates from the Apache Software Foundation.

Security researcher Noriaki Iwasaki from Cyber Defense Institute, Inc. identified two distinct but related vulnerabilities that exploit insufficient input validation in Apache

Jena’s Fuseki server administration interface. The key findings include:

• CVE-2025-49656 (Path Traversal): Classified with “important” severity, this vulnerability enables users with administrator access to create database files outside the designated files area of the Fuseki server, fundamentally breaking the containment model that prevents administrative operations from affecting system files beyond the application’s intended scope.
• CVE-2025-50151 (Configuration Upload Bypass): This complementary vulnerability allows administrative users to upload configuration files without proper path validation checks, permitting attackers with administrative privileges to reference arbitrary file system locations through malicious configuration uploads.
• Coordinated Disclosure: Both vulnerabilities were announced simultaneously on July 21, 2025, through official Apache mailing lists, indicating a coordinated disclosure process that effectively bypasses security boundaries designed to isolate the application environment.

Apache Jena Vulnerabilities

The vulnerabilities pose significant risks to organizations running Apache Jena in production environments, particularly those utilizing the Fuseki triple store server for semantic data management.

Since these vulnerabilities require administrative access to exploit, the primary attack vector involves compromised administrator accounts or malicious insiders with elevated privileges.

However, the ability to create files outside the server directory space could enable attackers to overwrite critical system files, plant backdoors, or exfiltrate sensitive data from unexpected locations.

Enterprise deployments using Apache Jena for knowledge graphs, linked data applications, and semantic web services are particularly vulnerable, as these systems often handle sensitive organizational data and integrate with broader enterprise infrastructure.

The path traversal capabilities could potentially allow attackers to access configuration files, application logs, or other sensitive resources that should remain isolated from the Jena application scope.

Immediate Upgrade to Version 5.5.0

Apache developers have released version 5.5.0 specifically to address both vulnerabilities, implementing enhanced input validation and removing the ability for arbitrary configuration file uploads entirely.

For CVE-2025-49656, the fix includes proper path sanitization to prevent file creation outside designated directories, while CVE-2025-50151 is resolved by eliminating the vulnerable configuration upload functionality altogether.

The Apache Security Team strongly recommends that all users running affected versions upgrade immediately to the patched release.

Organizations unable to immediately upgrade should implement additional access controls around administrative functions and monitor file system activity for unauthorized file creation attempts.

However, these measures provide only temporary mitigation, and upgrading remains the definitive solution to eliminate the security risks posed by these vulnerabilities.

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