CVE-2025-31582: Contact Form vCard Generator XSS Flaw

CVE-2025-31582 Overview

CVE-2025-31582 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the Contact Form vCard Generator WordPress plugin developed by Ashish Ajani. The vulnerability stems from improper neutralization of input during web page generation (CWE-79), allowing attackers to inject malicious scripts that persist in the application and execute whenever users view the affected content.

This vulnerability enables attackers to inject persistent malicious payloads through the plugin's contact form functionality. When administrators or other users view the submitted form data, the stored XSS payload executes in their browser context, potentially leading to session hijacking, credential theft, or further compromise of the WordPress installation.

Critical Impact

Unauthenticated attackers can inject persistent malicious scripts through the Contact Form vCard Generator plugin, potentially compromising WordPress admin sessions and enabling site takeover.

Affected Products

• Contact Form vCard Generator WordPress Plugin version 2.4 and earlier
• WordPress installations with the contact-form-vcard-generator plugin installed
• All WordPress versions running vulnerable plugin versions

Discovery Timeline

• 2025-04-03 - CVE-2025-31582 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-31582

Vulnerability Analysis

This Stored XSS vulnerability occurs when user-supplied input through the contact form is not properly sanitized before being stored in the database and subsequently rendered in the WordPress admin interface. Unlike reflected XSS, stored XSS persists within the application, making it particularly dangerous as it can affect multiple users over time without requiring social engineering for each attack.

The vulnerability requires no authentication to exploit, as attackers can submit malicious payloads through the public-facing contact form. However, user interaction is required for the payload to execute—specifically, an administrator must view the submitted form data for the injected script to run in their browser context.

The impact includes potential compromise of confidentiality, integrity, and availability. Attackers can steal session cookies, perform actions on behalf of authenticated administrators, deface content, or redirect users to malicious sites. The scope is changed, meaning the vulnerability can affect resources beyond its original security context.

Root Cause

The root cause of CVE-2025-31582 is insufficient input validation and output encoding in the Contact Form vCard Generator plugin. When form submissions are processed, the plugin fails to properly sanitize user input before storing it in the WordPress database. Additionally, when this data is retrieved and displayed in the admin panel, it is not properly escaped or encoded, allowing embedded scripts to execute.

WordPress provides built-in sanitization functions such as sanitize_text_field(), esc_html(), and wp_kses() specifically designed to prevent XSS attacks. The vulnerable plugin versions do not adequately utilize these security functions, creating an exploitable condition.

Attack Vector

The attack vector for this vulnerability is network-based, requiring an attacker to submit a specially crafted contact form entry containing malicious JavaScript code. The attack follows this general pattern:

1. An attacker identifies a WordPress site using the vulnerable Contact Form vCard Generator plugin
2. The attacker submits a contact form with XSS payload embedded in form fields
3. The malicious data is stored in the WordPress database without proper sanitization
4. When an administrator views the submitted form data, the XSS payload executes
5. The script can then steal session tokens, create new admin accounts, or perform other malicious actions

The vulnerability does not require authentication, and exploitation complexity is low. For detailed technical information about the vulnerability, refer to the Patchstack WordPress Vulnerability Advisory.

Detection Methods for CVE-2025-31582

Indicators of Compromise

• Unusual JavaScript code or <script> tags present in contact form submissions stored in the database
• Unexpected admin account creations or privilege escalations following form submission reviews
• Browser console errors or unexpected network requests when viewing form entries in the WordPress admin
• Modified WordPress options or settings that weren't changed by legitimate administrators

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS patterns in form submissions
• Enable WordPress audit logging to track administrative actions and detect unauthorized changes
• Scan the wp_postmeta and plugin-specific database tables for suspicious HTML/JavaScript content
• Monitor for unusual outbound network connections originating from admin browser sessions

Monitoring Recommendations

• Deploy Content Security Policy (CSP) headers to restrict script execution sources and receive violation reports
• Configure real-time alerting for new admin account creation or privilege changes
• Implement database query monitoring to detect retrieval of potentially malicious stored content
• Regularly audit installed plugins and their versions against known vulnerability databases

How to Mitigate CVE-2025-31582

Immediate Actions Required

• Update the Contact Form vCard Generator plugin to a patched version if available from the developer
• If no patch is available, temporarily deactivate and remove the contact-form-vcard-generator plugin
• Review and sanitize existing contact form submissions in the database for malicious content
• Audit WordPress admin accounts for any unauthorized additions or privilege changes
• Invalidate all active admin sessions and require password resets for administrative users

Patch Information

As of the last update, users should check the official WordPress plugin repository for an updated version of Contact Form vCard Generator that addresses this vulnerability. The vulnerable versions include version 2.4 and all earlier versions. Monitor the Patchstack WordPress Vulnerability Advisory for updates on patch availability.

If the plugin is no longer maintained, consider migrating to an alternative contact form plugin with active security support.

Workarounds

• Deactivate the Contact Form vCard Generator plugin until a security patch is released
• Implement a Web Application Firewall (WAF) with XSS filtering rules to sanitize form inputs
• Add manual input validation using WordPress hooks before form data is stored
• Deploy Content Security Policy headers to mitigate the impact of any successful XSS injection

# Configuration example - Add CSP header to WordPress via .htaccess
# Place in your WordPress root .htaccess file
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"
</IfModule>