CVE-2025-24602: WP24 Domain Check Reflected XSS Vulnerability

CVE-2025-24602 Overview

CVE-2025-24602 is a Reflected Cross-Site Scripting (XSS) vulnerability affecting the WP24 Domain Check plugin for WordPress. This vulnerability arises from improper neutralization of user-supplied input during web page generation, allowing attackers to inject malicious scripts that execute in the context of a victim's browser session.

The WP24 Domain Check plugin (wp24-domain-check) fails to properly sanitize input parameters, enabling attackers to craft malicious URLs that, when visited by authenticated users, can execute arbitrary JavaScript code. This type of Reflected XSS attack requires user interaction, typically achieved through phishing or social engineering tactics.

Critical Impact

Successful exploitation allows attackers to steal session cookies, perform actions on behalf of authenticated users, deface web content, or redirect users to malicious sites. WordPress administrator accounts are particularly valuable targets.

Affected Products

• WP24 Domain Check plugin versions up to and including 1.10.14
• WordPress installations running vulnerable versions of the wp24-domain-check plugin
• All WordPress sites with the affected plugin activated

Discovery Timeline

• 2025-02-04 - CVE-2025-24602 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-24602

Vulnerability Analysis

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), which represents one of the most prevalent web application security flaws. The WP24 Domain Check plugin processes user input without adequate sanitization or output encoding, creating an injection point for malicious scripts.

When a user interacts with the affected functionality, attacker-controlled data is reflected back into the HTML response without proper escaping. The attack requires user interaction—victims must click a crafted link or visit a malicious page that redirects to the vulnerable endpoint. The scope of this vulnerability is changed (meaning it can affect resources beyond the vulnerable component), potentially impacting the confidentiality, integrity, and availability of the WordPress installation.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding within the WP24 Domain Check plugin. The plugin accepts user-controllable input and reflects it back into the page without applying proper HTML entity encoding, JavaScript escaping, or Content Security Policy protections. This allows specially crafted input containing JavaScript code to be interpreted and executed by the browser.

Attack Vector

This is a network-based attack that requires no prior authentication or privileges on the target system. However, it does require user interaction—the victim must be convinced to click on a malicious link or visit a compromised page. The attack flow typically involves:

1. Attacker crafts a malicious URL containing JavaScript payload targeting the vulnerable plugin endpoint
2. Attacker distributes the malicious link via phishing emails, social media, or compromised websites
3. Victim clicks the link while authenticated to the WordPress site
4. The malicious script executes in the victim's browser context
5. Attacker achieves their objective (session theft, credential harvesting, or malicious actions)

The vulnerability affects the domain check functionality of the plugin, where user input related to domain lookups is not properly sanitized before being rendered in the response.

Detection Methods for CVE-2025-24602

Indicators of Compromise

• Unusual URL parameters containing encoded JavaScript or HTML tags in requests to wp24-domain-check endpoints
• Web server logs showing requests with suspicious query strings containing <script>, javascript:, onerror=, or similar XSS payloads
• User reports of unexpected browser behavior or redirects when using domain check functionality
• JavaScript errors in browser console related to blocked inline scripts (if CSP is in place)

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS patterns in request parameters
• Monitor web server access logs for requests containing encoded script tags or event handlers targeting the wp24-domain-check plugin
• Deploy browser-based XSS detection tools that can identify reflected content in page responses
• Use vulnerability scanning tools to identify unpatched WordPress plugins

Monitoring Recommendations

• Enable detailed logging for all WordPress plugin activity, particularly for user input processing
• Configure alerts for unusual patterns in URL query strings, especially those containing potential XSS payloads
• Monitor for new or modified JavaScript files that could indicate successful exploitation
• Track authentication events following visits to pages with suspicious URL parameters

How to Mitigate CVE-2025-24602

Immediate Actions Required

• Update the WP24 Domain Check plugin to a patched version if available from the WordPress plugin repository
• If no patch is available, temporarily deactivate the wp24-domain-check plugin until a fix is released
• Review web server logs for evidence of exploitation attempts
• Implement Content Security Policy (CSP) headers to mitigate the impact of XSS vulnerabilities

Patch Information

Organizations should check the Patchstack WordPress Vulnerability Report for the latest patch status and remediation guidance. Monitor the official WordPress plugin repository for updated versions of the WP24 Domain Check plugin that address this vulnerability. Until a patch is available, the recommended mitigation is to deactivate the plugin or implement WAF rules to block malicious requests.

Workarounds

• Deactivate the WP24 Domain Check plugin via the WordPress admin panel under Plugins → Installed Plugins
• Implement strict Content Security Policy headers to prevent inline script execution
• Deploy a Web Application Firewall with rules to filter XSS payloads in request parameters
• Restrict access to the WordPress admin area to trusted IP addresses to limit the attack surface

# WordPress wp-config.php - Add CSP headers as a mitigation measure
# Add to your theme's functions.php or a security plugin configuration

# Example Apache .htaccess CSP header configuration
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"

# To deactivate the plugin via WP-CLI
wp plugin deactivate wp24-domain-check

# Verify the plugin is deactivated
wp plugin status wp24-domain-check