CVE-2025-9194 Overview
CVE-2025-9194 affects the Constructor theme for WordPress in all versions up to and including 1.6.5. The vulnerability stems from a missing capability check on the clean() function exposed through the theme's AJAX handler. Authenticated attackers with Subscriber-level access or higher can trigger a theme clean operation without proper authorization. This flaw is classified under [CWE-862] Missing Authorization. The issue impacts data integrity by allowing low-privileged users to modify theme state that should be restricted to administrators.
Critical Impact
Any authenticated WordPress user, including subscribers, can invoke the theme's clean() function and modify theme data without authorization.
Affected Products
- WordPress Constructor theme versions through 1.6.5
- WordPress installations with the Constructor theme active and user registration enabled
- Sites permitting Subscriber-level or higher account creation
Discovery Timeline
- 2025-10-03 - CVE-2025-9194 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-9194
Vulnerability Analysis
The Constructor theme exposes a clean() function through its AJAX interface in libs/Constructor/Ajax.php. WordPress themes and plugins must verify user capabilities before executing privileged actions. The Constructor theme omits this check, so any authenticated request can invoke the handler. The result is unauthorized modification of theme data by users who should have no administrative rights.
The vulnerability affects confidentiality none, integrity low, and availability none according to the CVSS vector. Subscriber accounts are the minimum privilege required, which is the default role for self-registered users on many WordPress sites. This lowers the barrier for exploitation on sites with open registration.
Root Cause
The root cause is a missing capability check in the AJAX handler that dispatches to the clean() function. WordPress provides current_user_can() and nonce verification mechanisms for exactly this purpose. The Constructor theme registers the AJAX endpoint using wp_ajax_ hooks accessible to all logged-in users, but does not gate execution behind an administrator capability such as manage_options or edit_theme_options.
Attack Vector
Exploitation requires an authenticated session at Subscriber level or above. The attacker sends a crafted POST request to /wp-admin/admin-ajax.php targeting the vulnerable action. Because no capability check runs, the server executes the clean() operation and modifies theme data. No user interaction beyond the authenticated request is required. See the WordPress Constructor Ajax File and the Wordfence Vulnerability Analysis for technical details.
Detection Methods for CVE-2025-9194
Indicators of Compromise
- POST requests to /wp-admin/admin-ajax.php from Subscriber-level accounts targeting Constructor theme actions
- Unexpected changes or resets to theme configuration and cached theme data
- AJAX request volume spikes from low-privileged accounts shortly after registration
Detection Strategies
- Audit WordPress access logs for admin-ajax.php calls invoking Constructor theme actions from non-administrator sessions
- Review the Constructor theme source at libs/Constructor/Ajax.php for presence of the clean() handler and confirm the installed version
- Correlate new user registrations with subsequent AJAX activity to identify probing behavior
Monitoring Recommendations
- Enable request logging on admin-ajax.php and forward events to a central log platform for analysis
- Alert on WordPress role changes and theme configuration modifications performed outside administrator sessions
- Monitor theme integrity by hashing configuration state and comparing over time
How to Mitigate CVE-2025-9194
Immediate Actions Required
- Update the Constructor theme to a version later than 1.6.5 once the vendor releases a patched release
- Disable open user registration or restrict the default role until the theme is updated
- Deactivate and replace the Constructor theme if no patched version is available for your site
Patch Information
No fixed version is documented in the NVD entry at the time of publication. Consult the Wordfence Vulnerability Analysis and the WordPress theme repository for updated patch status. Apply the vendor fix as soon as it becomes available.
Workarounds
- Block requests to admin-ajax.php targeting Constructor theme actions using a web application firewall rule
- Restrict Subscriber account creation on public-facing sites where the theme remains in use
- Remove or rename the vulnerable AJAX handler in libs/Constructor/Ajax.php as a temporary compensating control
# Example WordPress hardening: disable open registration
wp option update users_can_register 0
# Example: set default role to a restricted value
wp option update default_role subscriber
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
