CVE-2025-30794: StellarWP Event Tickets XSS Vulnerability

CVE-2025-30794 Overview

CVE-2025-30794 is a Reflected Cross-Site Scripting (XSS) vulnerability affecting the StellarWP Event Tickets plugin for WordPress. This vulnerability stems from improper neutralization of user 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, redirect users to malicious sites, perform actions on behalf of authenticated users, or harvest credentials from WordPress administrators and site visitors.

Affected Products

• StellarWP Event Tickets plugin versions up to and including 5.20.0
• WordPress installations with the vulnerable Event Tickets plugin installed
• All websites utilizing the affected plugin versions for event management

Discovery Timeline

• 2025-04-01 - CVE-2025-30794 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-30794

Vulnerability Analysis

This vulnerability falls under CWE-79 (Improper Neutralization of Input During Web Page Generation), specifically manifesting as a Reflected Cross-Site Scripting flaw. The Event Tickets plugin fails to properly sanitize user-supplied input before reflecting it back to the browser, allowing attackers to craft malicious URLs containing JavaScript payloads.

When a victim clicks a specially crafted link, the malicious script executes within the security context of the vulnerable WordPress site. This can lead to session hijacking, credential theft, defacement, or further attacks against the victim's browser and system.

The vulnerability requires user interaction, meaning an attacker must trick a victim into clicking a malicious link. However, the scope change characteristic indicates that the XSS payload can affect resources beyond the vulnerable component, potentially impacting other pages or frames on the same origin.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding within the Event Tickets plugin. When user-controlled data is incorporated into the web page response without proper sanitization, the browser interprets malicious input as legitimate code rather than treating it as data.

WordPress plugins that handle user input for event management, ticketing, and RSVP functionality are particularly susceptible to XSS vulnerabilities if developers do not consistently apply WordPress's built-in sanitization functions such as esc_html(), esc_attr(), and wp_kses().

Attack Vector

The attack vector is network-based, requiring an attacker to craft a malicious URL containing the XSS payload and deliver it to potential victims through phishing emails, social engineering, or by embedding the link on attacker-controlled websites. When a logged-in WordPress administrator clicks the malicious link, the attacker can potentially:

1. Capture the administrator's session cookie for account takeover
2. Create new administrator accounts through CSRF-like actions
3. Modify site content or install malicious plugins
4. Redirect users to phishing pages mimicking legitimate login forms

The vulnerability manifests when malicious input is reflected in the page output without proper encoding. For detailed technical information about the specific vulnerable parameters and exploitation mechanics, refer to the Patchstack security advisory.

Detection Methods for CVE-2025-30794

Indicators of Compromise

• Unexpected JavaScript execution or browser behavior when accessing Event Tickets plugin pages
• Suspicious URL parameters containing encoded script tags or JavaScript event handlers in web server access logs
• User reports of unusual redirects or popup windows when interacting with event-related pages
• Anomalous outbound connections from client browsers to unfamiliar domains

Detection Strategies

• Monitor web application firewall (WAF) logs for XSS attack patterns targeting the Event Tickets plugin endpoints
• Implement Content Security Policy (CSP) headers and monitor for policy violations that may indicate XSS attempts
• Review web server access logs for URLs containing suspicious characters such as <script>, javascript:, or encoded variants like %3Cscript%3E
• Deploy client-side JavaScript monitoring to detect unexpected script execution patterns

Monitoring Recommendations

• Enable WordPress activity logging to track plugin-related requests and potential exploitation attempts
• Configure real-time alerting for WAF rule triggers related to XSS attack signatures
• Monitor browser developer console errors reported through error tracking services for signs of injected script failures
• Regularly audit referrer logs for suspicious traffic patterns originating from unknown external sources

How to Mitigate CVE-2025-30794

Immediate Actions Required

• Update the Event Tickets plugin to a version newer than 5.20.0 that contains the security fix
• Review web server logs for any evidence of prior exploitation attempts targeting this vulnerability
• Implement or strengthen Web Application Firewall rules to block common XSS payloads
• Educate users and administrators about the risks of clicking untrusted links

Patch Information

StellarWP has addressed this vulnerability in versions of the Event Tickets plugin released after 5.20.0. Administrators should update to the latest available version through the WordPress plugin repository. For detailed patch information and remediation guidance, consult the Patchstack vulnerability database.

Workarounds

• Implement strict Content Security Policy headers to restrict inline script execution and mitigate XSS impact
• Deploy a Web Application Firewall with updated XSS detection rules to filter malicious requests
• Temporarily disable the Event Tickets plugin if updating is not immediately possible and the functionality is not critical
• Restrict administrative access to trusted IP addresses to limit the attack surface for credential theft scenarios

# Example Content Security Policy header configuration for Apache
# Add to .htaccess or virtual host configuration
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'self';"