CVE-2025-1281 Overview
The BM Content Builder plugin for WordPress contains an arbitrary file deletion vulnerability affecting all versions up to and excluding 3.17.1. The flaw resides in the ux_cb_remove_layout_ajax() and ux_cb_tools_export_ajax() functions, which fail to validate file paths supplied by authenticated requests. Attackers holding Subscriber-level access or above can delete arbitrary files on the underlying server. Deleting sensitive files such as wp-config.php can trigger WordPress installation reset flows, enabling attackers to reconfigure the site and achieve remote code execution.
Critical Impact
Authenticated attackers with minimal privileges can delete arbitrary files, including wp-config.php, leading to full site takeover and remote code execution.
Affected Products
- BM Content Builder plugin for WordPress, all versions prior to 3.17.1
- WordPress sites bundling the BM Content Builder via ThemeForest themes
- Any site permitting Subscriber-level or higher account registration with the plugin installed
Discovery Timeline
- 2026-09-22 - CVE-2025-1281 published to the National Vulnerability Database
- 2026-09-22 - Last updated in NVD database
Technical Details for CVE-2025-1281
Vulnerability Analysis
The vulnerability is a path traversal flaw classified under [CWE-22]. Two AJAX endpoints, ux_cb_remove_layout_ajax() and ux_cb_tools_export_ajax(), accept file path parameters from authenticated users without sanitizing traversal sequences or restricting operations to the plugin's own directory.
Because the endpoints are reachable by any authenticated account, the required privilege level is Subscriber, which is the lowest role WordPress grants. Many WordPress sites permit open registration for Subscribers, effectively lowering the barrier to exploitation.
Once an attacker deletes wp-config.php, WordPress treats the site as uninstalled and presents the installation wizard on the next request. The attacker can then supply attacker-controlled database credentials, gain administrator access, and upload malicious plugins or themes to execute arbitrary PHP code.
Root Cause
The root cause is missing input validation on file path arguments passed to file deletion routines. The plugin does not canonicalize the target path, reject ../ traversal sequences, or confirm that the resolved path is contained within an allowed directory. There is also no capability check restricting the AJAX handlers to privileged roles.
Attack Vector
Exploitation requires network access to the WordPress site and valid Subscriber credentials. The attacker authenticates, obtains a valid nonce for the vulnerable AJAX action, and submits a crafted request specifying a relative path such as one that resolves to wp-config.php. The plugin resolves the path relative to the WordPress root and deletes the file. See the Wordfence Vulnerability Report for additional technical detail.
Detection Methods for CVE-2025-1281
Indicators of Compromise
- Unexpected POST requests to admin-ajax.php with action=ux_cb_remove_layout_ajax or action=ux_cb_tools_export_ajax originating from low-privileged accounts
- Missing or recently deleted wp-config.php, .htaccess, or theme and plugin bootstrap files
- Sudden appearance of the WordPress installation wizard on a previously configured site
- New administrator accounts created immediately after configuration files were recreated
Detection Strategies
- Review web server access logs for AJAX requests containing traversal sequences such as ../ in path parameters
- Correlate authenticated Subscriber sessions with file system modification events in the WordPress directory
- Alert on integrity changes to wp-config.php and core WordPress bootstrap files using file integrity monitoring
Monitoring Recommendations
- Enable WordPress audit logging for user role changes, plugin installations, and administrator account creation
- Forward web server and PHP error logs to a centralized platform for correlation across sessions and file activity
- Monitor outbound connections from the PHP-FPM process for indicators of post-exploitation webshell activity
How to Mitigate CVE-2025-1281
Immediate Actions Required
- Update the BM Content Builder plugin to version 3.17.1 or later on all affected WordPress sites
- Audit user accounts and remove any unexpected Subscriber or higher-privileged accounts
- Verify the integrity of wp-config.php and other core WordPress files against known-good backups
- Rotate database credentials, WordPress secret keys, and administrator passwords if compromise is suspected
Patch Information
The vendor addressed the vulnerability in BM Content Builder version 3.17.1 by adding file path validation to the affected AJAX handlers. Sites using bundled versions distributed with ThemeForest themes should confirm the theme has been updated to include the patched plugin. Reference the ThemeForest theme listing and the Wordfence Vulnerability Report for version details.
Workarounds
- Disable open user registration in WordPress general settings until the plugin is patched
- Deactivate the BM Content Builder plugin if an immediate update is not possible
- Restrict access to admin-ajax.php for the vulnerable actions using a web application firewall rule
- Apply strict file system permissions preventing the web server user from deleting wp-config.php
# Restrict wp-config.php against deletion by the web server user
chown root:www-data /var/www/html/wp-config.php
chmod 640 /var/www/html/wp-config.php
chattr +i /var/www/html/wp-config.php
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
