CVE-2025-8213: NinjaScanner WordPress Privilege Escalation

CVE-2025-8213 Overview

CVE-2025-8213 is an arbitrary file deletion vulnerability in the NinjaScanner – Virus & Malware scan plugin for WordPress. The flaw affects all versions up to and including 3.2.5. It stems from insufficient file path validation in the nscan_ajax_quarantine and nscan_quarantine_select functions. Authenticated attackers with Administrator-level access or above can delete arbitrary files on the server, including files located outside the WordPress root directory. The vulnerability is tracked as [CWE-36: Absolute Path Traversal].

Critical Impact
Attackers with administrator privileges can delete arbitrary server files, including wp-config.php, enabling site takeover by forcing WordPress into a setup state.

Affected Products

NinjaScanner – Virus & Malware scan plugin for WordPress
All versions up to and including 3.2.5
WordPress installations using the vulnerable plugin

Discovery Timeline

2025-07-31 - CVE-2025-8213 published to NVD
2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-8213

Vulnerability Analysis

The NinjaScanner plugin provides quarantine functionality to isolate files identified as malicious. Two functions, nscan_ajax_quarantine in lib/ajax_hooks.php and nscan_quarantine_select in lib/tab_quarantine.php, accept user-supplied file path input. These functions fail to validate or sanitize the supplied path before performing file system operations. An authenticated administrator can supply an absolute or traversal path that points outside the WordPress installation directory. The plugin then operates on the attacker-controlled path, resulting in deletion of arbitrary files on the host filesystem.

Root Cause

The root cause is missing path validation on file path parameters passed to quarantine handlers. The code does not enforce that the target path resides within the expected quarantine or uploads directory. The Wordfence advisory and the WordPress plugin source code references demonstrate the vulnerable handlers. The fix was committed in WordPress Changeset #3336569.

Attack Vector

Exploitation requires an authenticated session with Administrator or higher privileges. The attacker sends an AJAX request to the quarantine endpoint with a manipulated file path parameter pointing to a sensitive file such as wp-config.php or system files outside the web root. The plugin processes the request and deletes the targeted file. Deletion of wp-config.php returns WordPress to its initial installation state, allowing the attacker to reconfigure the site against a database under their control and achieve full code execution. See the WordPress NinjaScanner AJAX Code and WordPress NinjaScanner Quarantine Code for the vulnerable logic.

Detection Methods for CVE-2025-8213

Indicators of Compromise

Unexpected AJAX requests to admin-ajax.php invoking the nscan_ajax_quarantine action with absolute or traversal path parameters
Missing or recently deleted wp-config.php, .htaccess, or core WordPress files
WordPress site reverting to the installation setup screen unexpectedly
Web server error log entries referencing missing files previously present

Detection Strategies

Inspect web server access logs for POST requests to admin-ajax.php containing the nscan_ action and path parameters with ../ sequences or absolute paths
Audit installed plugin versions and flag NinjaScanner instances at 3.2.5 or below
Monitor filesystem integrity for unexpected deletions in the WordPress root and parent directories

Monitoring Recommendations

Enable WordPress audit logging for administrator-initiated AJAX actions tied to the NinjaScanner plugin
Forward web server and PHP error logs to a centralized log analytics platform and alert on file-not-found errors for critical WordPress files
Track administrator account logins and correlate session activity with plugin AJAX endpoints

How to Mitigate CVE-2025-8213

Immediate Actions Required

Update the NinjaScanner plugin to a version newer than 3.2.5 that includes WordPress Changeset #3336569
If an update is not immediately possible, deactivate and remove the NinjaScanner plugin
Review administrator accounts and revoke unused or stale credentials
Restore any deleted files from backup and validate site integrity

Patch Information

The vendor addressed the vulnerability in the commit referenced by WordPress Changeset #3336569. The fix adds validation on the file path parameters processed by nscan_ajax_quarantine and nscan_quarantine_select, restricting deletion to the intended quarantine directory. Site operators should upgrade to the latest plugin release from the WordPress plugin repository. Additional analysis is available in the Wordfence Vulnerability Report.

Workarounds

Restrict administrative access using IP allowlists or VPN-only access to /wp-admin/
Enforce multi-factor authentication on all administrator accounts to reduce the risk of credential abuse
Apply principle of least privilege and limit the number of accounts with the Administrator role
Configure filesystem permissions so the web server user cannot modify files outside the WordPress installation directory

bash

# Example: tighten file ownership so PHP cannot delete files outside the web root
sudo chown -R root:root /etc /var/log
sudo find /var/www/html -type d -exec chmod 755 {} \;
sudo find /var/www/html -type f -exec chmod 644 {} \;
sudo chmod 600 /var/www/html/wp-config.php