CVE-2025-32655: Restrict User Registration CSRF Vulnerability

CVE-2025-32655 Overview

CVE-2025-32655 is a Cross-Site Request Forgery (CSRF) vulnerability in the DevriX Restrict User Registration WordPress plugin that can be chained to achieve Stored Cross-Site Scripting (XSS). This vulnerability allows an attacker to trick an authenticated administrator into performing unintended actions, ultimately leading to the injection of malicious scripts that persist in the application and execute in the browsers of other users.

Critical Impact

Attackers can leverage this CSRF-to-Stored XSS chain to compromise WordPress administrator sessions, potentially leading to full site takeover, data theft, and malware distribution to site visitors.

Affected Products

• DevriX Restrict User Registration plugin versions from n/a through 1.0.1
• WordPress installations using the vulnerable plugin versions

Discovery Timeline

• 2025-04-17 - CVE-2025-32655 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-32655

Vulnerability Analysis

This vulnerability represents a compound attack vector combining two distinct web application security flaws. The primary weakness is a Cross-Site Request Forgery (CSRF) vulnerability classified under CWE-352, which occurs when the plugin fails to properly validate that requests originate from legitimate user actions within the application.

The CSRF flaw enables attackers to craft malicious web pages or links that, when visited by an authenticated WordPress administrator, submit unauthorized requests to the vulnerable plugin's settings endpoints. Because the plugin does not implement proper anti-CSRF tokens or nonce verification on critical operations, these forged requests are processed as if they were legitimate administrator actions.

The secondary impact is Stored XSS, where the attacker-controlled input submitted via the CSRF attack is stored in the database without proper sanitization or output encoding. When this stored data is subsequently rendered to other users or administrators, the malicious scripts execute in their browser context.

Root Cause

The root cause of this vulnerability is twofold:

1. Missing CSRF Protection: The Restrict User Registration plugin fails to implement WordPress nonce verification on form submissions and state-changing operations. WordPress provides built-in functions like wp_nonce_field() and wp_verify_nonce() for CSRF protection, but these safeguards were not properly implemented in the affected endpoints.

2. Insufficient Input Sanitization: User-supplied data is stored without adequate sanitization using functions like sanitize_text_field() or wp_kses(), and output is rendered without proper escaping using functions like esc_html() or esc_attr().

Attack Vector

The attack leverages network-based access and requires minimal attacker prerequisites, though it does depend on user interaction from an authenticated administrator. The attack flow typically proceeds as follows:

1. The attacker identifies an administrative endpoint in the Restrict User Registration plugin that lacks CSRF protection
2. A malicious HTML page is crafted containing a hidden form that auto-submits to the vulnerable endpoint with XSS payload data
3. The attacker distributes the malicious page link to WordPress administrators via phishing emails, forum posts, or other social engineering methods
4. When an authenticated administrator visits the malicious page, the hidden form automatically submits the forged request
5. The malicious JavaScript payload is stored in the WordPress database
6. Subsequent visitors to pages rendering the stored data have the malicious script executed in their browsers

The vulnerability can be exploited to steal session cookies, redirect users to phishing sites, inject cryptocurrency miners, deface the website, or distribute malware to site visitors.

Detection Methods for CVE-2025-32655

Indicators of Compromise

• Unexpected or unauthorized changes to Restrict User Registration plugin settings
• Suspicious JavaScript code appearing in plugin configuration fields or database tables
• Unusual outbound network requests from administrator or visitor browsers
• Reports of unexpected redirects or pop-ups from site users

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block CSRF attack patterns
• Monitor WordPress database tables associated with the plugin for unexpected script tags or JavaScript event handlers
• Enable detailed access logging for WordPress admin pages and review for suspicious referer headers
• Deploy Content Security Policy (CSP) headers to detect and report inline script execution attempts

Monitoring Recommendations

• Configure real-time alerts for modifications to plugin settings outside of normal administrative workflows
• Implement file integrity monitoring on WordPress core, theme, and plugin files
• Review server access logs for POST requests to plugin endpoints with unusual or external referer values
• Monitor browser console errors and CSP violation reports for signs of blocked XSS attempts

How to Mitigate CVE-2025-32655

Immediate Actions Required

• Deactivate and remove the Restrict User Registration plugin version 1.0.1 or earlier until a patched version is available
• Review WordPress database for any injected malicious scripts and sanitize affected records
• Audit administrator accounts for signs of compromise and force password resets if suspicious activity is detected
• Implement a Web Application Firewall with WordPress-specific rulesets to provide defense-in-depth protection

Patch Information

As of the publication date, the vulnerability affects Restrict User Registration versions through 1.0.1. Organizations should monitor the Patchstack WordPress Vulnerability Report and the WordPress plugin repository for updates from DevriX addressing this vulnerability. Until a patch is released, the plugin should be considered unsafe for production use.

Workarounds

• Remove or deactivate the Restrict User Registration plugin entirely until a security patch is available
• Implement strict Content Security Policy headers to mitigate the impact of any stored XSS payloads
• Use a WordPress security plugin that provides virtual patching capabilities for known vulnerabilities
• Limit administrative access to trusted networks only and ensure administrators use dedicated browsers for WordPress management
• Consider alternative plugins that provide similar user registration restriction functionality with better security practices