CVE-2025-64224: Grand Conference Theme XSS Vulnerability

CVE-2025-64224 Overview

CVE-2025-64224 is a Reflected Cross-Site Scripting (XSS) vulnerability in the ThemeGoods Grand Conference Theme Custom Post Type 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.

Critical Impact

Attackers can exploit this Reflected XSS vulnerability to steal session cookies, hijack user sessions, perform actions on behalf of authenticated users, and potentially compromise WordPress administrator accounts.

Affected Products

• ThemeGoods Grand Conference Theme Custom Post Type versions prior to 2.6.4
• WordPress installations using the grandconference-custom-post plugin

Discovery Timeline

• 2025-11-06 - CVE-2025-64224 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2025-64224

Vulnerability Analysis

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The Grand Conference Theme Custom Post Type plugin fails to properly sanitize user-controlled input before reflecting it back in web page output. This creates an attack surface where malicious JavaScript code can be injected and executed within the security context of the vulnerable WordPress site.

The network-based attack vector means exploitation can occur remotely, though it requires user interaction (such as clicking a crafted link). When successfully exploited, this vulnerability can impact the confidentiality, integrity, and availability of the affected system, potentially affecting resources beyond the vulnerable component's security scope.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and output encoding within the Grand Conference Theme Custom Post Type plugin. When processing user-supplied data, the plugin fails to properly escape or sanitize input before including it in dynamically generated HTML content. This allows attackers to craft malicious payloads that bypass the application's security controls and inject arbitrary JavaScript into the rendered page.

Attack Vector

The attack vector for CVE-2025-64224 is network-based and requires user interaction. An attacker must craft a malicious URL containing XSS payload parameters and convince a victim to click on it. When the victim visits the crafted URL while authenticated to the WordPress site, the malicious script executes in their browser context.

The attack flow typically involves:

1. Attacker identifies vulnerable input parameters in the Grand Conference Theme Custom Post Type plugin
2. Attacker crafts a malicious URL containing JavaScript payload in the vulnerable parameter
3. Attacker distributes the malicious link via phishing emails, social media, or other channels
4. Victim clicks the link while authenticated to the target WordPress site
5. The malicious script executes with the victim's session privileges

For detailed technical information about this vulnerability, refer to the Patchstack XSS Vulnerability Advisory.

Detection Methods for CVE-2025-64224

Indicators of Compromise

• Suspicious URL parameters containing encoded JavaScript in requests to WordPress sites using the Grand Conference plugin
• Unexpected script execution events or XSS alert patterns in web application firewall logs
• User session anomalies such as sessions being accessed from multiple geographic locations simultaneously
• Reports from users about unexpected pop-ups or behavior when accessing the WordPress site

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block common XSS payload patterns in URL parameters
• Monitor server access logs for requests containing suspicious encoded characters like %3Cscript%3E, javascript:, or event handlers like onerror
• Implement Content Security Policy (CSP) headers with violation reporting to detect XSS attempts
• Use browser-based XSS detection tools and security plugins to identify injection attempts

Monitoring Recommendations

• Enable detailed logging for the WordPress site to capture all incoming requests with full URL parameters
• Configure security information and event management (SIEM) rules to alert on XSS attack patterns
• Monitor for changes in user behavior patterns that might indicate session hijacking
• Set up automated vulnerability scanning to identify unpatched WordPress plugins

How to Mitigate CVE-2025-64224

Immediate Actions Required

• Update the Grand Conference Theme Custom Post Type plugin to version 2.6.4 or later immediately
• Review WordPress access logs for any suspicious activity that may indicate prior exploitation
• Consider temporarily disabling the plugin if immediate patching is not possible
• Implement a Web Application Firewall with XSS protection rules as an additional defense layer

Patch Information

ThemeGoods has addressed this vulnerability in version 2.6.4 of the Grand Conference Theme Custom Post Type plugin. Users should update to this version or later through the WordPress plugin management interface or by downloading the latest version from the official source. After updating, verify the plugin version in the WordPress admin panel under Plugins.

For additional details about this vulnerability and patch information, see the Patchstack XSS Vulnerability Advisory.

Workarounds

• Implement Content Security Policy (CSP) headers to restrict script execution sources and mitigate XSS impact
• Deploy a Web Application Firewall configured to block XSS attack patterns targeting the plugin's input parameters
• Restrict access to the WordPress admin panel to trusted IP addresses only
• Enable HTTP-only and Secure flags on session cookies to reduce session hijacking risk

# Example Apache configuration for Content Security Policy header
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'self';"