CVE-2025-6258 in WP SoundSystem Plugin
Summary
by MITRE • 06/26/2025
The WP SoundSystem plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's wpsstm-track shortcode in all versions up to, and including, 3.4.2 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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Analysis
by VulDB Data Team • 06/26/2025
The WP SoundSystem plugin for WordPress represents a critical security vulnerability classified as CVE-2025-6258, which manifests as a stored cross-site scripting flaw affecting versions through 3.4.2. This vulnerability resides within the plugin's wpsstm-track shortcode implementation where insufficient input sanitization and output escaping mechanisms fail to properly validate user-supplied attributes. The flaw allows authenticated attackers with contributor-level privileges or higher to execute malicious code injection attacks that persist across user sessions, making this a particularly dangerous threat vector for WordPress environments.
The technical exploitation of this vulnerability occurs through the manipulation of the wpsstm-track shortcode attributes, where user input flows directly into the plugin's output rendering without proper sanitization. This creates a persistent XSS attack surface where malicious scripts can be stored within the WordPress database and executed whenever legitimate users access pages containing the compromised shortcode. The vulnerability specifically targets the plugin's handling of user-supplied parameters, which should undergo strict validation and sanitization before being processed or rendered. This represents a clear violation of secure coding practices and falls under CWE-79, which addresses cross-site scripting vulnerabilities through inadequate input validation and output encoding.
The operational impact of CVE-2025-6258 extends beyond simple script injection, as it enables attackers to perform various malicious activities including cookie theft, session hijacking, and redirection to malicious websites. Attackers with contributor-level access can leverage this vulnerability to compromise the entire WordPress environment, potentially leading to full administrative control over the site. The stored nature of the vulnerability means that once injected, malicious scripts will execute automatically for any user who accesses the affected pages, creating a persistent threat that can affect multiple users over time. This vulnerability directly aligns with ATT&CK technique T1566.001, which covers credential access through social engineering, as attackers can use the XSS to harvest user credentials and session information.
Organizations affected by this vulnerability should immediately implement mitigations including plugin updates to versions that address the sanitization issues, implementation of input validation controls, and output escaping mechanisms. The recommended approach involves applying the latest plugin version from the official WordPress repository, which should contain proper sanitization of user attributes and appropriate output encoding. Additionally, administrators should consider implementing web application firewalls, content security policies, and regular security audits to detect and prevent similar vulnerabilities. The vulnerability also underscores the importance of principle of least privilege, ensuring that users with contributor-level access cannot perform actions that could compromise site security, as recommended by NIST cybersecurity frameworks. Regular security monitoring and vulnerability scanning should be implemented to identify and remediate similar issues before they can be exploited by malicious actors.