CVE-2024-8664 in WP Test Email Plugin
Summary
by MITRE • 09/13/2024
The WP Test Email plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 1.1.7. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 03/10/2025
The WP Test Email plugin for WordPress represents a critical security vulnerability through its implementation of reflected cross-site scripting that affects all versions up to and including 1.1.7. This vulnerability stems from improper handling of user-supplied input within URL parameters, creating an attack surface that allows malicious actors to execute arbitrary JavaScript code in the context of a victim's browser. The flaw specifically manifests when the plugin utilizes add_query_arg function without adequate escaping mechanisms, which directly violates fundamental web security principles and creates persistent injection points within the application's URL handling logic.
The technical implementation of this vulnerability occurs within the plugin's parameter processing where user-controllable data flows directly into URL construction without proper sanitization or encoding. When an attacker crafts a malicious URL containing crafted script payloads within the plugin's query parameters, these scripts become embedded in the page output and execute when the page loads in a victim's browser. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws, and represents a classic reflected XSS attack pattern where the malicious input is reflected back to the user without proper output encoding. The vulnerability is particularly dangerous because it requires no authentication from the attacker, making it an unauthenticated attack vector that can be exploited through social engineering techniques such as phishing emails or compromised links.
The operational impact of this vulnerability extends beyond simple script execution to potentially enable more sophisticated attacks including session hijacking, credential theft, and redirection to malicious sites. An attacker could craft payloads that steal cookies, modify page content, or redirect users to phishing pages that mimic legitimate WordPress interfaces. The reflected nature of this attack means that successful exploitation requires user interaction through clicking malicious links, but the ease of implementation and the broad attack surface make this vulnerability particularly concerning for WordPress installations. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1566 for phishing and T1059 for command and scripting interpreter, creating a complete attack chain from initial compromise to potential persistence.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security hardening practices. The primary fix involves updating to a patched version of the WP Test Email plugin where proper escaping mechanisms have been implemented for all URL parameter handling. Security practitioners should also implement input validation and output encoding at multiple layers including web application firewalls that can detect and block malicious script payloads in URL parameters. Additionally, administrators should conduct comprehensive security audits of all installed WordPress plugins to identify similar vulnerabilities that might exist in other third-party components. The vulnerability demonstrates the critical importance of proper parameter handling and input sanitization in web applications, reinforcing industry best practices outlined in OWASP Top Ten and similar security frameworks that emphasize the need for comprehensive input validation and output encoding to prevent XSS attacks. Organizations should also implement security monitoring that can detect unusual URL patterns or script injection attempts within their WordPress environments.