CVE-2025-22282: ez Form Calculator Premium XSS Vulnerability

CVE-2025-22282 Overview

CVE-2025-22282 is a Reflected Cross-Site Scripting (XSS) vulnerability in the ez Form Calculator Premium WordPress plugin developed by keksdieb. The vulnerability exists due to 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 execute arbitrary JavaScript in victim browsers, potentially leading to session hijacking, credential theft, and unauthorized actions on behalf of authenticated users.

Affected Products

• ez Form Calculator Premium WordPress Plugin versions through 2.14.1.2
• WordPress installations with the vulnerable plugin activated
• All users accessing pages containing the vulnerable plugin components

Discovery Timeline

• 2025-04-04 - CVE-2025-22282 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-22282

Vulnerability Analysis

This vulnerability falls under CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The ez Form Calculator Premium plugin fails to properly sanitize user input before reflecting it back in the web page response. When a user clicks a malicious link containing crafted parameters, the unsanitized input is rendered directly in the browser, executing attacker-controlled JavaScript code.

The attack requires user interaction, as victims must click a maliciously crafted link or visit an attacker-controlled page that redirects to the vulnerable endpoint. However, the scope is changed, meaning the vulnerability can affect resources beyond the vulnerable component itself, potentially impacting the entire WordPress installation and user sessions.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding in the ez Form Calculator Premium plugin. User-supplied data is reflected in the HTTP response without proper sanitization or HTML entity encoding. The plugin likely accepts parameters through GET or POST requests that are directly embedded into the page HTML without escaping special characters such as <, >, ", and '.

Attack Vector

The attack is network-based and requires an attacker to craft a malicious URL containing JavaScript payload in vulnerable parameters. The attacker then needs to trick a victim into clicking this URL through social engineering techniques such as phishing emails, malicious advertisements, or compromised websites. When the victim clicks the link while authenticated to the WordPress site, the malicious script executes with the victim's session privileges, potentially allowing:

• Session cookie theft
• Keylogging of sensitive form inputs
• Defacement of the page content
• Redirects to phishing pages
• Actions performed on behalf of the authenticated user

The vulnerability mechanism involves the plugin accepting user input through HTTP parameters, which is then reflected directly into the page HTML without proper encoding. For detailed technical information, refer to the Patchstack Vulnerability Advisory.

Detection Methods for CVE-2025-22282

Indicators of Compromise

• Unusual URL parameters containing JavaScript syntax such as <script>, onerror=, onload=, or encoded variants
• Web server logs showing requests with suspicious payloads in query strings targeting form calculator endpoints
• Browser console errors indicating blocked inline script execution (if CSP is partially configured)
• Reports from users about unexpected behavior or redirects when accessing form pages

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block XSS patterns in URL parameters
• Review web server access logs for requests containing common XSS payloads targeting the ez Form Calculator plugin endpoints
• Deploy browser-based XSS protection mechanisms and Content Security Policy headers
• Use automated vulnerability scanners to identify reflected XSS vulnerabilities in WordPress installations

Monitoring Recommendations

• Enable detailed logging on WordPress and monitor for anomalous requests to plugin endpoints
• Configure alerting for suspicious JavaScript patterns in URL query parameters
• Monitor for unusual user session behavior that may indicate session hijacking
• Track plugin version information and compare against known vulnerable versions

How to Mitigate CVE-2025-22282

Immediate Actions Required

• Update the ez Form Calculator Premium plugin to a version newer than 2.14.1.2 once a patch is available
• Consider temporarily deactivating the plugin until a patched version is released
• Implement a Web Application Firewall (WAF) with XSS detection rules
• Deploy Content Security Policy (CSP) headers to mitigate the impact of successful XSS attacks

Patch Information

Check for updated versions of the ez Form Calculator Premium plugin from the official source. Review the Patchstack Vulnerability Advisory for the latest patch status and remediation guidance. Monitor the plugin developer's release notes for security updates addressing this XSS vulnerability.

Workarounds

• Temporarily disable the ez Form Calculator Premium plugin if it is not business-critical
• Implement strict Content Security Policy headers to prevent inline script execution: Content-Security-Policy: script-src 'self'
• Configure WAF rules to filter requests containing XSS patterns targeting plugin endpoints
• Restrict access to WordPress admin pages to trusted IP addresses to reduce attack surface

# WordPress wp-config.php - Add security headers via plugin or server config
# Example Apache .htaccess configuration for CSP headers
<IfModule mod_headers.c>
    Header set Content-Security-Policy "script-src 'self'; object-src 'none';"
    Header set X-XSS-Protection "1; mode=block"
    Header set X-Content-Type-Options "nosniff"
</IfModule>