CVE-2025-24624: HT Event Plugin XSS Vulnerability

CVE-2025-24624 Overview

CVE-2025-24624 is a Reflected Cross-Site Scripting (XSS) vulnerability affecting the HT Event WordPress plugin developed by DevItems. This plugin, also known as "HT Event - WordPress Event Manager Plugin for Elementor," fails to properly neutralize 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 vulnerability to execute arbitrary JavaScript code in the browsers of authenticated users, potentially leading to session hijacking, credential theft, defacement of WordPress sites, or further attacks against site administrators.

Affected Products

• HT Event WordPress Plugin versions up to and including 1.4.6
• WordPress sites utilizing the HT Event plugin with Elementor integration
• DevItems HT Event (ht-event) all versions through 1.4.6

Discovery Timeline

• 2025-04-17 - CVE-2025-24624 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-24624

Vulnerability Analysis

This vulnerability stems from improper neutralization of input during web page generation, classified under CWE-79 (Cross-site Scripting). The HT Event plugin processes user-controllable input without adequate sanitization or output encoding, allowing reflected XSS attacks. In a reflected XSS scenario, the malicious payload is embedded in a crafted URL or form submission, and when a victim clicks the link or submits the form, the payload is reflected back by the server and executed in the victim's browser.

The vulnerability affects WordPress sites that have installed the HT Event plugin for managing events through Elementor. Since WordPress administrators often have elevated privileges, successful exploitation could grant attackers access to sensitive administrative functions or allow them to compromise the entire WordPress installation.

Root Cause

The root cause of CVE-2025-24624 lies in insufficient input validation and output encoding within the HT Event plugin. User-supplied data is incorporated into HTML output without proper sanitization, allowing special characters that form HTML or JavaScript syntax to be interpreted as code rather than data. This is a common oversight in WordPress plugin development where developers fail to use WordPress's built-in escaping functions such as esc_html(), esc_attr(), or wp_kses() before rendering user input.

Attack Vector

The attack vector for this reflected XSS vulnerability involves crafting a malicious URL containing JavaScript payload in a vulnerable parameter. When an unsuspecting user—particularly a WordPress administrator—clicks on this link, the server reflects the payload back in its response without proper encoding. The browser then executes the malicious script in the context of the WordPress site, giving the attacker the ability to:

• Steal session cookies and authentication tokens
• Perform actions on behalf of the authenticated user
• Modify page content visible to the victim
• Redirect users to malicious websites
• Harvest credentials through fake login forms

For technical details on the specific vulnerable parameters and exploitation mechanics, refer to the Patchstack security advisory.

Detection Methods for CVE-2025-24624

Indicators of Compromise

• Suspicious URL parameters containing encoded JavaScript code (e.g., <script>, javascript:, onerror=, onload=) in requests to HT Event plugin pages
• Unusual outbound connections from user browsers after visiting event-related pages on the WordPress site
• Reports from users about unexpected behavior or pop-ups when accessing event management features
• Web server logs showing requests with URL-encoded script tags or event handlers in query strings

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS payloads in URL parameters and form submissions
• Deploy browser-based Content Security Policy (CSP) headers to prevent execution of inline scripts
• Monitor web server access logs for patterns indicative of XSS probing, such as repeated requests with varying encoded payloads
• Use WordPress security plugins that scan for known vulnerable plugin versions and alert administrators

Monitoring Recommendations

• Enable detailed logging for the HT Event plugin and review logs for anomalous input patterns
• Configure real-time alerting for web requests containing suspicious JavaScript-related strings
• Implement file integrity monitoring to detect unauthorized modifications to plugin files
• Regularly audit WordPress plugin versions against known vulnerability databases like Patchstack and WPScan

How to Mitigate CVE-2025-24624

Immediate Actions Required

• Update the HT Event plugin to a patched version if one is available from DevItems
• If no patch is available, consider temporarily deactivating the HT Event plugin until a fix is released
• Implement a Web Application Firewall with XSS filtering rules to provide defense-in-depth
• Review and restrict administrative access to reduce the impact of potential exploitation
• Educate WordPress administrators about the risks of clicking untrusted links

Patch Information

As of the vulnerability disclosure, HT Event versions through 1.4.6 are confirmed vulnerable. Administrators should check the WordPress plugin repository or the Patchstack advisory for updates on patched versions. When a patch becomes available, update immediately through the WordPress admin dashboard or via WP-CLI.

Workarounds

• Temporarily disable the HT Event plugin if it is not critical to site operations
• Implement strict Content Security Policy (CSP) headers that block inline script execution
• Use a WAF rule to sanitize or block requests containing potential XSS payloads to HT Event endpoints
• Restrict access to WordPress administrative pages using IP allowlisting or VPN requirements
• Enable WordPress's built-in DISALLOW_UNFILTERED_HTML constant to limit HTML capabilities for non-administrator users

# Add CSP header in Apache .htaccess for WordPress
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"

# Or in Nginx configuration
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';";

# Disable unfiltered HTML in wp-config.php
define('DISALLOW_UNFILTERED_HTML', true);