CVE-2025-31573: PeproDev CF7 Database Stored XSS Flaw

CVE-2025-31573 Overview

CVE-2025-31573 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the PeproDev CF7 Database plugin for WordPress. This plugin, developed by Pepro Dev. Group, is designed to store and manage Contact Form 7 submissions. The vulnerability stems from improper neutralization of user-supplied input during web page generation, allowing attackers to inject malicious scripts that persist in the database and execute when administrators or users view the stored form data.

Critical Impact

Attackers can inject persistent malicious scripts through form submissions, potentially compromising WordPress administrator accounts, stealing session cookies, or redirecting users to malicious sites.

Affected Products

• PeproDev CF7 Database plugin versions up to and including 2.0.0
• WordPress installations using the vulnerable plugin versions
• Sites accepting Contact Form 7 submissions stored via this plugin

Discovery Timeline

• 2025-04-03 - CVE-2025-31573 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-31573

Vulnerability Analysis

This Stored XSS vulnerability (CWE-79) occurs when the PeproDev CF7 Database plugin fails to properly sanitize and encode user input from Contact Form 7 submissions before storing them in the database and rendering them in the WordPress admin interface. Unlike reflected XSS attacks that require victims to click malicious links, stored XSS payloads persist in the application's database and execute automatically whenever the affected content is displayed.

The vulnerability is particularly dangerous in this context because Contact Form 7 submissions are typically reviewed by site administrators. When an administrator views a form submission containing a malicious payload through the plugin's database interface, the script executes in their browser context with full administrative privileges.

Root Cause

The root cause is insufficient input validation and output encoding in the plugin's form data handling routines. The plugin stores Contact Form 7 submission data without adequately sanitizing potentially dangerous HTML and JavaScript content. When this data is subsequently retrieved and displayed in the WordPress admin panel, it is rendered without proper output encoding, allowing injected scripts to execute.

WordPress provides several built-in sanitization functions such as sanitize_text_field(), wp_kses(), and esc_html() that should be applied to user input. The vulnerable versions of PeproDev CF7 Database fail to properly implement these security measures across all input fields and output contexts.

Attack Vector

An attacker can exploit this vulnerability by submitting a Contact Form 7 form on a target website with JavaScript code embedded in one or more form fields. The malicious payload is stored in the database alongside legitimate form data. When a WordPress administrator accesses the plugin's database view to review submissions, the stored script executes in their browser.

The attack does not require authentication, as form submissions are typically accepted from anonymous visitors. The malicious script can perform actions such as creating new administrator accounts, modifying site content, exfiltrating sensitive data, or redirecting administrators to phishing pages. For technical details on the vulnerability mechanism, see the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-31573

Indicators of Compromise

• Unexpected JavaScript code or HTML tags present in Contact Form 7 submission records
• Unusual administrator account creations or privilege modifications
• Browser console errors or unexpected script execution when viewing form submissions
• Suspicious outbound network connections from administrator browsers while accessing the plugin

Detection Strategies

• Review stored Contact Form 7 submissions for suspicious content containing <script> tags, event handlers (e.g., onerror, onload), or encoded JavaScript
• Monitor WordPress audit logs for unauthorized administrator actions that may indicate session hijacking
• Implement Content Security Policy (CSP) headers to detect and block inline script execution
• Use web application firewalls (WAF) to detect and log XSS payloads in form submissions

Monitoring Recommendations

• Enable WordPress security logging to track administrative actions and plugin interactions
• Configure browser-based XSS protection mechanisms and monitor for policy violations
• Regularly audit the wp_posts and plugin-specific database tables for suspicious content patterns
• Set up alerts for new administrator account creation or privilege escalation events

How to Mitigate CVE-2025-31573

Immediate Actions Required

• Update PeproDev CF7 Database plugin to a patched version when available from the developer
• Temporarily deactivate the plugin if handling sensitive form submissions until a patch is released
• Review existing stored form submissions for suspicious JavaScript or HTML content
• Audit WordPress administrator accounts and reset credentials if compromise is suspected

Patch Information

A specific patch version was not identified in the available data. Site administrators should monitor the official WordPress plugin repository and the Patchstack Vulnerability Report for updates from Pepro Dev. Group regarding a security release that addresses this vulnerability.

Workarounds

• Implement a Web Application Firewall (WAF) rule to filter XSS payloads in Contact Form 7 submissions
• Consider using alternative Contact Form 7 database plugins that have been security-audited
• Restrict admin panel access to trusted IP addresses to limit the impact of potential XSS exploitation
• Add custom input sanitization through WordPress hooks before data is stored by the plugin

# WordPress wp-config.php security hardening
# Add Content Security Policy headers via Apache/Nginx or WordPress
# Example: Add to .htaccess for Apache servers
Header set Content-Security-Policy "script-src 'self'; object-src 'none';"