CVE-2023-28789
📋 TL;DR
This vulnerability allows unauthenticated attackers to inject malicious scripts into WordPress sites using the Contact Forms by Cimatti plugin. When users visit specially crafted URLs, the scripts execute in their browsers, potentially stealing credentials or performing unauthorized actions. All WordPress sites running vulnerable plugin versions are affected.
💻 Affected Systems
- WordPress Contact Forms by Cimatti plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator credentials, take over the WordPress site, install backdoors, deface the site, or pivot to internal network systems.
Likely Case
Attackers steal user session cookies, redirect users to malicious sites, or perform limited actions within the user's browser context.
If Mitigated
Script execution is blocked by Content Security Policy headers or browser protections, limiting impact to minor UI manipulation.
🎯 Exploit Status
Reflected XSS vulnerabilities are commonly exploited with simple payloads. Attackers need to trick users into clicking malicious links.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5.5 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Contact Forms by Cimatti'. 4. Click 'Update Now' if available. 5. Alternatively, download version 1.5.5+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily disable the Contact Forms by Cimatti plugin until patched
wp plugin deactivate contact-forms
Implement Content Security Policy
allAdd CSP headers to block inline script execution
Add to .htaccess: Header set Content-Security-Policy "script-src 'self'"
Add to nginx config: add_header Content-Security-Policy "script-src 'self'";
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block XSS payloads
- Disable the Contact Forms by Cimatti plugin and use alternative contact form solutions
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Installed Plugins for 'Contact Forms by Cimatti' version <= 1.5.4Check Version:
wp plugin get contact-forms --field=versionVerify Fix Applied:
Verify plugin version is 1.5.5 or higher in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual GET/POST requests with script tags or JavaScript in URL parameters
- Multiple 404 errors for crafted plugin-related URLs
Network Indicators:
- HTTP requests containing <script>, javascript:, or encoded XSS payloads in query strings
SIEM Query:
source="*access.log*" AND ("<script" OR "javascript:" OR "%3Cscript" OR "%22onload%3D") AND "contact-forms"🔗 References
- https://patchstack.com/database/vulnerability/contact-forms/wordpress-contact-forms-by-cimatti-plugin-1-5-4-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/contact-forms/wordpress-contact-forms-by-cimatti-plugin-1-5-4-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
