CVE-2025-8413 Overview
The Listeo theme for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in its soundcloud shortcode. Versions up to and including 2.0.8 fail to properly sanitize and escape user-supplied attributes passed through the shortcode. Authenticated users with contributor-level permissions or higher can inject arbitrary JavaScript into pages. The injected scripts execute in the browser of any user who views the compromised page. This vulnerability is tracked as CWE-79 and affects a commercial directory listings theme distributed through ThemeForest.
Critical Impact
Authenticated contributors can store malicious JavaScript that executes against site visitors and administrators, enabling session theft, redirects, and administrative account compromise.
Affected Products
- Listeo WordPress Theme versions ≤ 2.0.8
- Listeo soundcloud shortcode handler
- WordPress sites running the vulnerable theme with contributor-or-higher user registration enabled
Discovery Timeline
- 2025-10-25 - CVE-2025-8413 published to NVD
- 2026-10-08 - Last updated in NVD database
Technical Details for CVE-2025-8413
Vulnerability Analysis
The vulnerability resides in the Listeo theme's soundcloud shortcode handler. When WordPress parses shortcodes embedded in post or page content, attributes passed to the shortcode are rendered into the final HTML output. The Listeo implementation accepts attribute values without applying WordPress sanitization functions such as esc_attr(), esc_url(), or wp_kses(). As a result, attacker-supplied payloads inside shortcode attributes are reflected directly into the DOM.
Because the payload is stored in the post content database table, this is a persistent (stored) XSS rather than a reflected variant. The scope change in the CVSS vector reflects script execution outside the vulnerable component's security context, impacting the broader WordPress session. See the Wordfence Vulnerability Report for additional context.
Root Cause
The root cause is insufficient input sanitization and output escaping on user supplied attributes within the soundcloud shortcode. The handler trusts attribute content and concatenates it into HTML without context-aware encoding. This maps directly to CWE-79, Improper Neutralization of Input During Web Page Generation.
Attack Vector
An attacker with contributor-level access or higher creates a post containing the soundcloud shortcode with a crafted attribute. The attribute carries an HTML event handler or javascript: URI that breaks out of the rendered element. Once the post is published or previewed by an administrator or site visitor, the browser executes the stored payload. Successful exploitation enables cookie theft, forced administrative actions via CSRF chains, and persistent defacement.
No verified public proof-of-concept exploit is published for this CVE. Technical details are available through the vendor advisories referenced above.
Detection Methods for CVE-2025-8413
Indicators of Compromise
- Posts or pages containing [soundcloud] shortcodes with attribute values that include <script>, onerror=, onload=, or javascript: strings
- Unexpected outbound requests from administrator browsers to attacker-controlled domains after visiting internal content
- New or modified administrator accounts created shortly after contributor-authored content is viewed
- Session cookies observed in web server referrer logs or external request logs
Detection Strategies
- Query the wp_posts table for shortcode attributes containing HTML tags, event handlers, or protocol handlers: SELECT ID, post_title FROM wp_posts WHERE post_content REGEXP 'soundcloud[^]]*(<|javascript:|on[a-z]+=)'
- Deploy a Web Application Firewall rule to inspect POST requests to /wp-admin/post.php and /wp-admin/admin-ajax.php for soundcloud shortcode payloads containing script syntax
- Enable WordPress audit logging to track content creation and edits by contributor-role accounts
Monitoring Recommendations
- Monitor contributor and author account activity for anomalous post creation volumes or shortcode usage patterns
- Alert on administrative session anomalies such as impossible travel or new API tokens following content review workflows
- Track Content Security Policy (CSP) violation reports to identify inline script execution attempts on rendered pages
How to Mitigate CVE-2025-8413
Immediate Actions Required
- Update the Listeo theme to a version released after 2.0.8 once available from the vendor on ThemeForest
- Audit all existing posts and pages for malicious soundcloud shortcode content and remove injected payloads
- Review contributor and author accounts, disabling any that were created or modified without authorization
- Rotate administrator session cookies and credentials if exploitation is suspected
Patch Information
The vendor distributes Listeo through ThemeForest. Site operators should confirm patch availability via the Listeo product page and the Wordfence Vulnerability Report. Apply the fixed release across all environments including staging and backup sites.
Workarounds
- Restrict user registration and limit contributor-or-higher role assignments to vetted accounts only
- Deploy a Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
- Implement a Web Application Firewall rule to strip or block soundcloud shortcodes containing HTML tags or event handlers until the patch is applied
- Require administrator review of all contributor-submitted content in a sandboxed browser profile before publication
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.