CVE-2025-30902: AEC Kiosque Reflected XSS Vulnerability

CVE-2025-30902 Overview

CVE-2025-30902 is a Reflected Cross-Site Scripting (XSS) vulnerability discovered in the AEC Kiosque WordPress plugin developed by ATL Software SRL. This vulnerability arises from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts that execute in the context of a victim's browser session.

Reflected XSS vulnerabilities occur when user-supplied data is immediately returned by a web application in an error message, search result, or other response without proper sanitization. In this case, the AEC Kiosque plugin fails to adequately sanitize input before reflecting it back to users, creating an attack vector for script injection.

Critical Impact

Attackers can execute arbitrary JavaScript in victims' browsers, potentially stealing session cookies, credentials, or performing actions on behalf of authenticated users within WordPress admin panels.

Affected Products

• AEC Kiosque WordPress Plugin version 1.9.3 and earlier
• WordPress installations running vulnerable versions of aec-kiosque
• ATL Software SRL AEC Kiosque plugin (all versions through 1.9.3)

Discovery Timeline

• 2025-04-01 - CVE-2025-30902 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-30902

Vulnerability Analysis

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), which encompasses cross-site scripting flaws. The AEC Kiosque plugin processes user-controlled input without adequate validation or output encoding, allowing malicious scripts to be reflected back to users' browsers.

Reflected XSS attacks typically require social engineering to trick users into clicking a specially crafted link. Once clicked, the malicious payload executes within the security context of the vulnerable WordPress site, bypassing same-origin policy protections. This can lead to session hijacking, credential theft, defacement, or further exploitation of the WordPress installation.

The vulnerability affects all versions of the plugin from initial release through version 1.9.3. WordPress administrators running this plugin should assess their exposure and prioritize remediation.

Root Cause

The root cause of this vulnerability lies in insufficient input sanitization within the AEC Kiosque plugin. User-supplied data is included in HTTP responses without proper encoding or escaping, allowing HTML and JavaScript code to be rendered and executed by the browser. WordPress provides built-in functions like esc_html(), esc_attr(), and wp_kses() for output sanitization, but these protections were not properly implemented in the affected plugin code paths.

Attack Vector

The attack vector for this reflected XSS vulnerability involves crafting malicious URLs containing JavaScript payloads in vulnerable parameters. Attackers distribute these URLs through phishing emails, social media, or compromised websites. When a victim clicks the link while authenticated to the WordPress site, the injected script executes with the victim's session privileges.

A typical exploitation scenario involves an attacker inserting JavaScript code into a URL parameter that the AEC Kiosque plugin reflects in its response. The malicious script could perform actions such as:

• Exfiltrating session cookies to attacker-controlled servers
• Modifying page content to display phishing forms
• Performing administrative actions if the victim has elevated privileges
• Redirecting users to malicious websites

For technical details on the vulnerability mechanics, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-30902

Indicators of Compromise

• Unusual URL parameters containing JavaScript code or HTML tags in requests to WordPress sites
• Suspicious outbound connections from client browsers after visiting WordPress pages
• User reports of unexpected behavior or pop-ups when interacting with AEC Kiosque functionality
• Web server logs showing encoded script tags (<script>, javascript:, onerror=) in query strings

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block common XSS payloads in HTTP requests
• Monitor web server access logs for URL patterns containing script injection attempts
• Implement Content Security Policy (CSP) headers to restrict inline script execution and report violations
• Use WordPress security plugins to scan for known vulnerable plugin versions

Monitoring Recommendations

• Enable detailed logging for WordPress plugin activity and HTTP request parameters
• Configure alerting for CSP violation reports that may indicate exploitation attempts
• Regularly audit installed WordPress plugins against vulnerability databases
• Monitor user session anomalies that could indicate session hijacking following XSS exploitation

How to Mitigate CVE-2025-30902

Immediate Actions Required

• Update the AEC Kiosque plugin to a patched version when available from ATL Software SRL
• Consider temporarily deactivating and removing the aec-kiosque plugin until a fix is released
• Implement a Web Application Firewall (WAF) with XSS protection rules as an interim mitigation
• Review WordPress user sessions and force re-authentication for administrative accounts

Patch Information

At the time of publication, site administrators should check with ATL Software SRL for updated versions of the AEC Kiosque plugin that address this vulnerability. Monitor the Patchstack Vulnerability Report for updates on remediation status. Until an official patch is available, implementing defensive measures is strongly recommended.

Workarounds

• Deploy Content Security Policy headers to prevent inline script execution
• Use WordPress security plugins like Wordfence or Sucuri to add WAF protection
• Restrict access to plugin functionality to authenticated users only where possible
• Implement HTTP-only and Secure flags on session cookies to limit XSS impact

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