CVE-2025-23804: WP Service Payment Form CSRF Vulnerability

CVE-2025-23804 Overview

A Cross-Site Request Forgery (CSRF) vulnerability has been identified in the WP Service Payment Form With Authorize.net WordPress plugin, developed by Shiv Prakash Tiwari. This vulnerability allows attackers to exploit CSRF weaknesses to perform Reflected Cross-Site Scripting (XSS) attacks against authenticated users. The vulnerability affects all versions of the plugin up to and including version 2.6.0.

The CSRF-to-XSS attack chain presents a significant risk as it combines two distinct vulnerability types, allowing attackers to forge requests on behalf of authenticated users and inject malicious scripts into the application context.

Critical Impact

Attackers can leverage CSRF to execute reflected XSS attacks, potentially leading to session hijacking, credential theft, or unauthorized actions on behalf of authenticated WordPress administrators.

Affected Products

• WP Service Payment Form With Authorize.net plugin versions through 2.6.0
• WordPress installations using vulnerable versions of the plugin

Discovery Timeline

• 2025-01-16 - CVE-2025-23804 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-23804

Vulnerability Analysis

This vulnerability represents a chained attack scenario where Cross-Site Request Forgery (CSRF) enables Reflected Cross-Site Scripting (XSS). The plugin fails to implement proper CSRF token validation on certain form submissions, allowing external attackers to craft malicious requests that are executed when an authenticated user visits a specially crafted page.

The lack of proper nonce verification in the plugin's form handling allows attackers to bypass the same-origin policy protections that WordPress provides. When combined with insufficient input sanitization, this creates a pathway for reflected XSS payloads to be executed in the context of the victim's browser session.

Root Cause

The root cause is improper implementation of CSRF protections (CWE-352) within the WP Service Payment Form With Authorize.net plugin. The plugin does not adequately verify the origin and authenticity of incoming requests, and fails to properly sanitize user-supplied input before reflecting it back in HTTP responses.

WordPress provides built-in nonce functions (wp_nonce_field(), wp_verify_nonce()) specifically designed to prevent CSRF attacks, but this plugin does not properly utilize these security mechanisms in all vulnerable endpoints.

Attack Vector

An attacker can exploit this vulnerability by crafting a malicious webpage or link that, when visited by an authenticated WordPress user (particularly administrators), automatically submits a forged request to the vulnerable plugin endpoint. The request contains XSS payloads that get reflected back to the user's browser and executed with their session privileges.

The attack requires user interaction—specifically, the victim must click on a malicious link or visit an attacker-controlled webpage while authenticated to the WordPress site. Successful exploitation can lead to session theft, administrative account compromise, or unauthorized modifications to the WordPress installation.

For technical details regarding the vulnerability mechanism, refer to the PatchStack security advisory.

Detection Methods for CVE-2025-23804

Indicators of Compromise

• Unexpected form submissions or state changes in the WP Service Payment Form With Authorize.net plugin settings
• Suspicious outbound requests from authenticated user browsers containing encoded payloads
• Web server logs showing requests with unusual URL parameters or encoded JavaScript content
• User reports of unexpected redirects or browser behavior when accessing plugin-related pages

Detection Strategies

• Monitor web application firewall (WAF) logs for patterns indicating CSRF or XSS attack attempts against WordPress plugin endpoints
• Implement Content Security Policy (CSP) headers to detect and block inline script execution
• Review access logs for requests to plugin endpoints that lack proper WordPress nonce parameters
• Deploy browser-based XSS detection mechanisms that can identify reflected script injection attempts

Monitoring Recommendations

• Enable WordPress security logging to track administrative actions and plugin interactions
• Configure alerts for unusual patterns in HTTP Referer headers on sensitive plugin endpoints
• Implement real-time monitoring for JavaScript execution anomalies in administrative contexts
• Regularly audit plugin configurations for unauthorized changes that may indicate successful exploitation

How to Mitigate CVE-2025-23804

Immediate Actions Required

• Update the WP Service Payment Form With Authorize.net plugin to a patched version if available
• If no patch is available, consider temporarily disabling the plugin until a fix is released
• Review recent administrative actions and plugin settings for signs of compromise
• Implement additional WAF rules to filter potential CSRF and XSS attack patterns

Patch Information

Refer to the PatchStack vulnerability database for the latest patch status and remediation guidance. Site administrators should monitor for plugin updates through the WordPress dashboard and apply security patches as soon as they become available.

Workarounds

• Implement Web Application Firewall (WAF) rules to block requests with suspicious XSS patterns targeting the plugin
• Restrict access to WordPress administrative areas using IP allowlisting where feasible
• Enable HTTP-only and Secure flags on all session cookies to reduce impact of potential session hijacking
• Deploy Content Security Policy headers to mitigate the impact of reflected XSS attacks

# WordPress .htaccess security hardening example
# Add CSP header to mitigate XSS impact
<IfModule mod_headers.c>
    Header set X-Content-Type-Options "nosniff"
    Header set X-Frame-Options "SAMEORIGIN"
    Header set X-XSS-Protection "1; mode=block"
    Header set Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'"
</IfModule>