CVE-2015-9517 in Manual Purchases Extension
Summary
by MITRE
The Easy Digital Downloads (EDD) Manual Purchases 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 vulnerability CVE-2015-9517 affects the Easy Digital Downloads WordPress plugin ecosystem, specifically targeting the Manual Purchases extension that allows administrators to add purchases manually to the system. This issue manifests as a cross-site scripting vulnerability that stems from improper handling of query arguments within the plugin's codebase. The vulnerability exists across multiple version ranges including 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, indicating a widespread impact across the plugin's major releases. The core technical flaw involves the misuse of WordPress's add_query_arg function, which is designed to safely append query parameters to URLs while maintaining proper escaping and sanitization.
The exploitation of this vulnerability occurs when malicious actors manipulate query parameters within the plugin's administrative interface, particularly when adding manual purchases. The improper use of add_query_arg means that user-supplied input is not adequately sanitized before being rendered back to the browser, creating an opportunity for attackers to inject malicious JavaScript code. This vulnerability falls under CWE-79 - Improper Neutralization of Input During Web Page Generation, which specifically addresses cross-site scripting issues arising from insufficient input validation and output escaping. The attack vector typically involves an authenticated administrator or privileged user who is tricked into clicking a malicious link or viewing a crafted page that contains the XSS payload.
From an operational perspective, this vulnerability presents a significant risk to WordPress sites utilizing Easy Digital Downloads with the Manual Purchases extension. An attacker who can gain access to an administrator account or trick an administrator into executing malicious code can potentially escalate privileges, steal session cookies, perform actions on behalf of the administrator, or even redirect users to malicious sites. The impact extends beyond simple data theft as the vulnerability can be leveraged to modify purchase records, potentially affecting financial data integrity and customer information. This vulnerability also aligns with ATT&CK technique T1059.007 - Command and Scripting Interpreter: JavaScript, as it enables attackers to execute arbitrary JavaScript code in the context of the victim's browser session. The risk is particularly elevated in environments where administrators frequently interact with the plugin's manual purchase functionality, as the attack surface increases with the number of potential entry points.
The recommended mitigation strategy involves upgrading to the patched versions of the Easy Digital Downloads plugin where the vulnerability has been addressed through proper input sanitization and query argument handling. Organizations should also implement additional security measures including role-based access controls, regular security audits, and monitoring for unusual administrative activities. The fix typically involves ensuring that all user-supplied input passed through add_query_arg is properly escaped and validated before being rendered in the browser context. Security professionals should also consider implementing web application firewalls and content security policies to provide additional layers of protection against such vulnerabilities. Regular patch management processes should be established to ensure timely adoption of security updates and to maintain the overall security posture of WordPress installations.