CVE-2025-14508

Executive Summary

CVE-2025-14508 is a critical authorization bypass vulnerability in the MediaCommander – Bring Folders to Media, Posts, and Pages WordPress plugin (versions up to and including 2.3.1). The plugin’s REST API endpoint for importing CSV data performs a destructive operation—deleting all folder organization data—while only checking for the upload_files capability, which is granted to Author-level users and above. This missing capability check allows authenticated attackers with low privileges to permanently delete folder structures created by administrators and other users, leading to data loss and disruption of media organization.

This vulnerability is specific to the WordPress ecosystem and does not affect the underlying web server (Apache/Nginx). No public proof-of-concept (PoC) or exploit code has been released, and the EPSS score is 0.0%, indicating low exploitation likelihood at this time. However, the lack of a patch makes this a significant risk for sites using the plugin.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users should verify the integrity of their plugin files and monitor for updates. No known supply chain compromise has been reported.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – The endpoint is accessible over the network.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): Low (L) – Requires Author-level authentication.
• User Interaction (UI): None (N) – No user action needed.
• Scope (S): Unchanged (U) – The vulnerability does not affect other components.
• Confidentiality (C): None (N) – No data exposure.
• Integrity (I): Low (L) – Only folder organization data is deleted, not content.
• Availability (A): High (H) – Deletion of all folder data disrupts media management.

Overall Score: 6.5 (Medium)
Severity: Medium, but with high availability impact.

Deep Dive & Mechanics

The vulnerability resides in the import-csv REST API endpoint of the MediaCommander plugin. The endpoint is intended to allow authorized users to import folder structures from a CSV file. However, the code performs a destructive operation—deleting all existing folder organization data—before processing the import. The capability check uses upload_files, which is a capability granted to Author-level users and above in WordPress. This is inappropriate for a destructive operation that should require Administrator-level privileges (e.g., manage_options or delete_others_posts).

Attack Flow:

1. An attacker authenticates as an Author-level user (or higher).
2. The attacker sends a crafted POST request to the REST API endpoint /wp-json/mediacommander/v1/import-csv with a valid nonce.
3. The plugin executes the deletion of all folder organization data without verifying the user’s capability to perform such a destructive action.
4. All folder structures created by administrators and other users are permanently deleted.

Root Cause: The upload_files capability is too permissive for this operation. The plugin should use a capability like manage_options or a custom capability specific to folder management.

Vulnerable vs. Patched Code

Vulnerable Code (<= 2.3.1):

// In the REST API callback
public function import_csv( $request ) {
    if ( ! current_user_can( 'upload_files' ) ) {
        return new WP_Error( 'rest_forbidden', 'You do not have permission.', array( 'status' => 403 ) );
    }
    // Destructive operation: delete all folders
    global $wpdb;
    $wpdb->query( "DELETE FROM {$wpdb->prefix}mediacommander_folders" );
    // ... rest of import logic
}

Patched Code (Hypothetical):

public function import_csv( $request ) {
    if ( ! current_user_can( 'manage_options' ) ) {
        return new WP_Error( 'rest_forbidden', 'You do not have permission.', array( 'status' => 403 ) );
    }
    // Destructive operation: delete all folders
    global $wpdb;
    $wpdb->query( "DELETE FROM {$wpdb->prefix}mediacommander_folders" );
    // ... rest of import logic
}

The fix requires changing the capability check from upload_files to manage_options (or a custom capability) to ensure only administrators can perform this destructive action.

Exploitation & Lab Setup

Red Team

Prerequisites:

• WordPress instance with MediaCommander plugin <= 2.3.1 installed and activated.
• An Author-level user account (or higher).

Exploitation Steps:

1. Obtain a valid nonce for the REST API endpoint. This can be done by inspecting the plugin’s JavaScript or by using the WordPress REST API nonce endpoint.
2. Send a POST request to the endpoint with the nonce and an empty CSV file (or any valid CSV) to trigger the deletion.

Example cURL command:

curl -X POST \
  'https://target-site.com/wp-json/mediacommander/v1/import-csv' \
  -H 'Content-Type: multipart/form-data' \
  -H 'X-WP-Nonce: <valid_nonce>' \
  -F 'csv=@empty.csv'

Expected Outcome: All folder organization data is deleted, causing disruption to media management.

Blue Team

Detection:

• Monitor REST API requests to /wp-json/mediacommander/v1/import-csv from non-admin users.
• Alert on any successful POST requests to this endpoint from Author or Editor roles.
• Review logs for sudden deletion of folder data.

Hunting:

• Search for DELETE FROM wp_mediacommander_folders in database query logs.
• Look for unusual patterns of CSV imports from low-privileged users.

Indicators of Compromise (IOCs)

• Network: POST requests to /wp-json/mediacommander/v1/import-csv with a valid nonce from Author-level users.
• Database: Absence of records in wp_mediacommander_folders table after a non-admin action.
• File: No specific file IOCs, but plugin version <= 2.3.1 is a strong indicator.

Detection Engineering

YARA Rule

rule detect_mediacommander_vuln {
    meta:
        description = "Detects vulnerable MediaCommander plugin version <= 2.3.1"
        author = "Valters IT"
        date = "2025-02-20"
        reference = "CVE-2025-14508"
    strings:
        $vuln_func = "current_user_can( 'upload_files' )"
        $destructive = "DELETE FROM {$wpdb->prefix}mediacommander_folders"
    condition:
        $vuln_func and $destructive
}

Sigma Rule

title: MediaCommander Unauthorized Folder Deletion
id: 8a3f7c2e-5d1b-4a9f-8c6e-2b1d3f4a5c6e
status: experimental
description: Detects attempts to exploit CVE-2025-14508 by sending a POST request to the import-csv endpoint with Author-level privileges.
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: POST
        cs-uri-query|contains: "/wp-json/mediacommander/v1/import-csv"
    condition: selection
falsepositives:
    - Legitimate admin imports
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-14508 MediaCommander Unauthorized Folder Deletion"; flow:to_server; content:"POST"; http_method; content:"/wp-json/mediacommander/v1/import-csv"; http_uri; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Restrict access to the REST API endpoint using a Web Application Firewall (WAF) rule blocking POST requests to /wp-json/mediacommander/v1/import-csv from non-admin IPs.
3. Audit user roles and remove Author-level access from untrusted users.

Long-term Fix:

• The vendor must release a patched version that changes the capability check to manage_options or a custom capability.
• Implement proper authorization checks for all REST API endpoints.

Workaround:

• Add a custom function to your theme’s functions.php to override the capability check:

add_filter( 'user_has_cap', function( $allcaps, $caps, $args ) {
    if ( $args[0] === 'upload_files' && $args[2] === 'mediacommander_import_csv' ) {
        $allcaps[ $caps[0] ] = current_user_can( 'manage_options' );
    }
    return $allcaps;
}, 10, 3 );

Valters IT
Securing Digital Frontiers