CVE-2025-47685: Moloni Contribuinte Checkout CSRF Vulnerability

CVE-2025-47685 Overview

CVE-2025-47685 is a Cross-Site Request Forgery (CSRF) vulnerability in the Moloni Contribuinte Checkout WordPress plugin that enables attackers to execute Stored Cross-Site Scripting (XSS) attacks. This chained vulnerability allows malicious actors to bypass CSRF protections and inject persistent malicious scripts into the WordPress application, potentially compromising both administrators and site visitors.

Critical Impact

This CSRF-to-Stored-XSS vulnerability chain enables unauthenticated attackers to inject persistent malicious scripts through forged requests, potentially leading to session hijacking, credential theft, and unauthorized administrative actions.

Affected Products

• Moloni Contribuinte Checkout plugin versions up to and including 2.0.03
• WordPress installations running the vulnerable plugin versions

Discovery Timeline

• 2025-05-07 - CVE-2025-47685 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-47685

Vulnerability Analysis

This vulnerability represents a dangerous combination of two distinct web application security flaws. The primary vulnerability is a Cross-Site Request Forgery (CSRF) weakness stemming from missing or improper nonce verification in the Contribuinte Checkout plugin. This CSRF flaw serves as the entry point, allowing attackers to force authenticated administrators to perform unintended actions by tricking them into visiting a malicious webpage or clicking a crafted link.

The secondary component is a Stored XSS vulnerability that becomes exploitable through the CSRF weakness. When an administrator unknowingly submits a forged request, the attacker-controlled payload is permanently stored in the WordPress database. This stored payload then executes in the browsers of any user who views the affected page, including other administrators, making this particularly dangerous for site integrity.

The network-based attack vector requires user interaction—specifically, an authenticated administrator must be tricked into triggering the forged request. Once executed, the scope is changed, meaning the vulnerability can impact resources beyond the vulnerable component itself, affecting the broader WordPress installation and its users.

Root Cause

The root cause is inadequate CSRF protection mechanisms within the Contribuinte Checkout plugin. WordPress provides built-in nonce functionality (wp_nonce_field() and wp_verify_nonce()) specifically designed to prevent CSRF attacks, but the vulnerable versions of this plugin fail to properly implement or verify these security tokens on critical form submissions.

Additionally, the plugin lacks proper output encoding and input sanitization for user-supplied data, allowing malicious JavaScript payloads to be stored and subsequently rendered in user browsers without proper escaping.

Attack Vector

The attack follows a multi-stage exploitation pattern:

1. Reconnaissance: The attacker identifies a WordPress site running the vulnerable Contribuinte Checkout plugin version 2.0.03 or earlier
2. Payload Crafting: The attacker creates a malicious webpage containing a hidden form that submits a request to the vulnerable plugin endpoint with an XSS payload
3. Social Engineering: The attacker tricks a logged-in WordPress administrator into visiting the malicious page
4. CSRF Exploitation: When the admin visits the page, the hidden form automatically submits, bypassing CSRF protections
5. Payload Storage: The XSS payload is stored in the WordPress database
6. Execution: The malicious script executes whenever any user views the affected content, enabling session hijacking, keylogging, or further malicious actions

The attack requires network access and user interaction, but no authentication is needed from the attacker's side. For detailed technical analysis, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-47685

Indicators of Compromise

• Unexpected JavaScript code or <script> tags appearing in database fields associated with the Contribuinte Checkout plugin
• Anomalous administrative actions logged in WordPress that weren't initiated by known administrators
• Reports from users or administrators of unexpected browser behavior, redirects, or pop-ups when viewing checkout-related pages
• Unusual outbound connections from user browsers to unknown external domains

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS payload patterns in POST requests to WordPress admin endpoints
• Monitor WordPress database tables for suspicious script injections using regular integrity checks
• Review server access logs for unusual POST requests to Contribuinte Checkout plugin endpoints originating from external referrers
• Deploy Content Security Policy (CSP) headers to detect and report inline script execution attempts

Monitoring Recommendations

• Enable detailed logging for WordPress administrative actions and form submissions
• Configure browser-based security monitoring through CSP violation reports
• Implement real-time alerting for database modifications to plugin-related tables
• Conduct periodic security audits of stored content for injected scripts

How to Mitigate CVE-2025-47685

Immediate Actions Required

• Update the Contribuinte Checkout plugin to a patched version as soon as one becomes available from Moloni
• Review and audit existing database content for any injected malicious scripts
• Consider temporarily deactivating the plugin until a security patch is released
• Implement a Web Application Firewall (WAF) with CSRF and XSS protection rules

Patch Information

Security patches addressing this vulnerability should be obtained directly from the plugin vendor. Monitor the WordPress plugin repository and the Patchstack security database for updates regarding patched versions of Contribuinte Checkout.

Workarounds

• Restrict administrative access to trusted IP addresses only using .htaccess or server-level firewall rules
• Implement strict Content Security Policy headers to mitigate XSS impact by blocking inline script execution
• Add additional CSRF protection at the server level through security plugins like Wordfence or Sucuri
• Train administrators to avoid clicking links from untrusted sources while logged into WordPress

# WordPress .htaccess IP restriction for wp-admin
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/wp-admin
RewriteCond %{REMOTE_ADDR} !^192\.168\.1\.100$
RewriteRule ^(.*)$ - [F,L]
</IfModule>