CVE-2023-0272
📋 TL;DR
This vulnerability in the NEX-Forms WordPress plugin allows authenticated users with contributor role or higher to inject malicious scripts via shortcode attributes. The scripts are stored and executed when other users view affected pages/posts, enabling stored cross-site scripting attacks. WordPress sites using vulnerable versions of NEX-Forms are affected.
💻 Affected Systems
- NEX-Forms WordPress Plugin
📦 What is this software?
Nex Forms by Basixonline
⚠️ Risk & Real-World Impact
Worst Case
Attackers with contributor access could steal administrator credentials, deface websites, redirect users to malicious sites, or perform actions as authenticated users, potentially leading to complete site compromise.
Likely Case
Malicious contributors inject scripts that steal session cookies or display unwanted content to visitors, potentially leading to account takeover or reputation damage.
If Mitigated
With proper role-based access controls and input validation, impact is limited to low-privilege user actions and contained within the affected plugin's scope.
🎯 Exploit Status
Exploitation requires contributor-level access or higher. The vulnerability is publicly documented with technical details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.3.3
Vendor Advisory: https://wpscan.com/vulnerability/047b50c0-0eb3-4371-9e5d-3778fdafc66b
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find NEX-Forms and click 'Update Now'. 4. Verify version shows 8.3.3 or higher.
🔧 Temporary Workarounds
Disable NEX-Forms Plugin
allTemporarily disable the vulnerable plugin until patching is possible
wp plugin deactivate nex-forms
Restrict Contributor Role Access
allTemporarily remove contributor role permissions or downgrade users to subscriber role
wp user update <user_id> --role=subscriber
🧯 If You Can't Patch
- Implement strict input validation and output escaping for all shortcode attributes
- Apply web application firewall rules to block XSS payloads in POST/PUT requests
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins, find NEX-Forms and verify version is below 8.3.3Check Version:
wp plugin get nex-forms --field=versionVerify Fix Applied:
After updating, confirm NEX-Forms version shows 8.3.3 or higher in WordPress plugins list📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to wp-admin containing script tags in parameters
- Multiple failed login attempts followed by successful contributor login
Network Indicators:
- HTTP requests with suspicious script payloads in POST data to WordPress endpoints
SIEM Query:
source="wordpress.log" AND ("script" OR "javascript:" OR "onerror=" OR "onload=") AND "POST" AND "/wp-admin/"