CVE-2015-9515 in htaccess Editor Extension
Summary
by MITRE
The Easy Digital Downloads (EDD) htaccess Editor extension for WordPress, as used with EDD 1.8.x before 1.8.7, 1.9.x before 1.9.10, 2.0.x before 2.0.5, 2.1.x before 2.1.11, 2.2.x before 2.2.9, and 2.3.x before 2.3.7, has XSS because add_query_arg is misused.
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Analysis
by VulDB Data Team • 02/08/2025
The CVE-2015-9515 vulnerability affects the Easy Digital Downloads htaccess Editor extension for WordPress, a popular e-commerce plugin used for digital product sales. This vulnerability exists in multiple versions of the EDD plugin across several major release branches, specifically impacting versions prior to 1.8.7, 1.9.10, 2.0.5, 2.1.11, 2.2.9, and 2.3.7 respectively. The flaw manifests as a cross-site scripting vulnerability that arises from improper handling of user input within the plugin's administrative interface. This represents a critical security weakness that could allow attackers to execute malicious scripts in the context of an administrator's browser session.
The technical root cause of this vulnerability lies in the improper usage of WordPress's add_query_arg function within the htaccess editor functionality. When administrators interact with the plugin's interface to manage htaccess rules, the application fails to properly sanitize or escape user-supplied parameters before incorporating them into dynamic URL generation. This misapplication creates an injection point where malicious input can be processed and subsequently rendered in the browser without adequate security controls. The vulnerability specifically targets the administrative dashboard where privileged users manage plugin settings, making it particularly dangerous as it could enable attackers to escalate privileges or compromise the entire WordPress installation.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the ability to manipulate the plugin's behavior and potentially gain unauthorized access to sensitive administrative functions. An attacker who successfully exploits this vulnerability could inject malicious JavaScript code that would execute whenever an administrator views the htaccess editor page, potentially leading to session hijacking, data theft, or further exploitation of the WordPress environment. This vulnerability is particularly concerning because it affects widely deployed versions of the EDD plugin, making it a prime target for automated attacks. The vulnerability aligns with CWE-79, which describes cross-site scripting flaws, and could be categorized under ATT&CK technique T1059.007 for script injection attacks.
Organizations using affected versions of the EDD plugin should immediately implement mitigation strategies including updating to the patched versions mentioned in the advisory, implementing web application firewalls to detect and block malicious input patterns, and conducting thorough security audits of plugin installations. Additionally, administrators should consider restricting administrative access to the minimum necessary privileges and implementing proper input validation at multiple layers of the application architecture. The vulnerability demonstrates the importance of proper parameter sanitization in web applications and highlights the need for continuous security testing of third-party plugins, particularly those with administrative functionality that can impact system security.