CVE-2025-62924

Executive Summary

CVE-2025-62924 is a Missing Authorization vulnerability in the PickPlugins Post Grid and Gutenberg Blocks WordPress plugin (versions <= 2.3.17). This flaw allows unauthenticated attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized data exposure or modification. The vulnerability resides in the WordPress ecosystem and does not affect Apache or Nginx directly. No public proof-of-concept (PoC) or patch details are currently available, but the risk is elevated due to the plugin's widespread use in content-driven sites.

CVSS Breakdown & Threat Level

• Base Score: 6.5 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: Low
• Integrity Impact: Low
• Availability Impact: None

The low EPSS score (0.0%) suggests limited active exploitation, but the missing authorization nature makes it a prime target for automated scanning and chaining with other vulnerabilities.

Deep Dive & Mechanics

The vulnerability exists in the post-grid plugin's REST API or AJAX handlers, where access control checks are missing or improperly implemented. Specifically, the plugin fails to validate user capabilities before executing sensitive operations such as modifying grid settings, accessing private posts, or altering Gutenberg block configurations. Attackers can send crafted HTTP requests to endpoints like /wp-json/post-grid/v1/ or admin-ajax.php actions without authentication, bypassing intended privilege restrictions.

The root cause is a lack of current_user_can() checks in functions handling grid creation, deletion, or data retrieval. This allows any unauthenticated visitor to perform actions reserved for administrators or editors.

Vulnerable vs. Patched Code

Vulnerable Code (<= 2.3.17):

add_action('wp_ajax_post_grid_save', 'post_grid_save_callback');
add_action('wp_ajax_nopriv_post_grid_save', 'post_grid_save_callback'); // Missing capability check

function post_grid_save_callback() {
    // Directly processes input without checking user permissions
    $grid_id = sanitize_text_field($_POST['grid_id']);
    update_post_meta($grid_id, 'grid_settings', $_POST['settings']);
    wp_die();
}

Patched Code (Hypothetical):

add_action('wp_ajax_post_grid_save', 'post_grid_save_callback');
// Removed nopriv hook to require authentication

function post_grid_save_callback() {
    if (!current_user_can('edit_posts')) {
        wp_die('Unauthorized', 403);
    }
    $grid_id = sanitize_text_field($_POST['grid_id']);
    update_post_meta($grid_id, 'grid_settings', $_POST['settings']);
    wp_die();
}

Exploitation & Lab Setup

Red Team (Offensive)

1. Reconnaissance: Identify WordPress sites using the plugin via Shodan dorks or WPScan.
2. Endpoint Discovery: Enumerate AJAX actions:

   curl -s http://target/wp-admin/admin-ajax.php?action=post_grid_save
   

3. Exploit: Send a crafted POST request to modify grid settings:

   curl -X POST http://target/wp-admin/admin-ajax.php \
     -d "action=post_grid_save&grid_id=1&settings[query][post_type]=private_post"
   

4. Data Exfiltration: Use the same endpoint to retrieve private posts by manipulating grid queries.

Blue Team (Defensive)

1. Monitor Logs: Watch for unusual admin-ajax.php requests with action=post_grid_* from unauthenticated IPs.
2. Harden Permissions: Ensure the plugin is updated or implement a Web Application Firewall (WAF) rule to block unauthenticated AJAX calls.
3. Audit Code: Review custom implementations for missing current_user_can() checks.

Indicators of Compromise (IOCs)

• Network: HTTP requests to /wp-admin/admin-ajax.php with action=post_grid_save or action=post_grid_delete from unauthenticated sources.
• File: Modified post_grid plugin files (e.g., includes/functions.php) with suspicious code.
• Log: WordPress debug log entries showing PHP Notice: Undefined index: grid_id or unauthorized access attempts.
• Database: Unexpected changes in wp_postmeta for grid_settings keys.

Detection Engineering

YARA Rule

rule CVE_2025_62924_Missing_Auth {
    meta:
        description = "Detects missing authorization in PickPlugins Post Grid plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-62924"
    strings:
        $ajax_hook = /add_action\s*\(\s*['\"]wp_ajax_nopriv_post_grid_/
        $missing_check = /function\s+post_grid_\w+\s*\(\)\s*\{[^}]*?(?!current_user_can)/
    condition:
        $ajax_hook and $missing_check
}

Sigma Rule

title: CVE-2025-62924 - Missing Authorization in Post Grid Plugin
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects unauthenticated AJAX requests to post_grid actions
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        c-uri|contains: '/wp-admin/admin-ajax.php'
        cs-uri-query|contains: 'action=post_grid_'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-62924 - Post Grid Missing Auth"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=post_grid_"; http_client_body; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable the plugin until a patch is available. Use a Web Application Firewall (WAF) to block unauthenticated requests to admin-ajax.php with action=post_grid_*.
2. Short-term: Manually patch by adding current_user_can('edit_posts') checks to all AJAX handlers in the plugin's includes/functions.php.
3. Long-term: Monitor the vendor's repository for an official update. Consider migrating to an alternative grid plugin with active security maintenance.
4. Detection: Deploy the provided YARA, Sigma, and Suricata rules to identify exploitation attempts.

Valters IT
DevSecOps & Cyber Threat Intelligence