CVE-2023-6828
📋 TL;DR
This vulnerability allows unauthenticated attackers to inject malicious JavaScript into WordPress sites using the ARForms Form Builder plugin. When users visit pages containing the injected scripts, their browsers execute the attacker's code, potentially leading to session hijacking, credential theft, or site defacement. All WordPress sites running ARForms Form Builder version 1.5.8 or earlier are affected.
💻 Affected Systems
- ARForms Form Builder WordPress Plugin
📦 What is this software?
Arforms Form Builder by Reputeinfosystems
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, take over the WordPress site, install backdoors, redirect visitors to malicious sites, or use the compromised site to attack visitors' browsers.
Likely Case
Attackers inject malicious scripts that steal user session cookies or credentials, redirect users to phishing pages, or display unwanted advertisements.
If Mitigated
With proper web application firewalls and input validation, the attack would be blocked before reaching the vulnerable plugin.
🎯 Exploit Status
The vulnerability requires no authentication and exploitation is straightforward via HTTP requests containing malicious scripts in the arf_http_referrer_url parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5.9 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find ARForms Form Builder. 4. Click 'Update Now' if available. 5. If no update appears, download version 1.5.9+ from WordPress.org and manually update.
🔧 Temporary Workarounds
Web Application Firewall Rule
allBlock or sanitize requests containing script tags in the arf_http_referrer_url parameter
Temporary Plugin Deactivation
linuxDisable the ARForms plugin until patched
wp plugin deactivate arforms-form-builder
🧯 If You Can't Patch
- Implement a web application firewall (WAF) with XSS protection rules
- Disable the ARForms plugin entirely and use alternative form plugins
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for ARForms Form Builder version numberCheck Version:
wp plugin get arforms-form-builder --field=versionVerify Fix Applied:
Verify plugin version is 1.5.9 or higher in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing 'arf_http_referrer_url' parameter with script tags or JavaScript code
- Unusual POST requests to WordPress form submission endpoints
Network Indicators:
- Incoming requests with encoded script payloads in referrer parameters
- Outbound connections to suspicious domains after form submissions
SIEM Query:
source="web_server" AND (uri_path="*wp-admin/admin-ajax.php*" OR uri_path="*wp-content/plugins/arforms-form-builder*") AND (http_param="*arf_http_referrer_url*" AND (http_param_value="*<script*" OR http_param_value="*javascript:*"))🔗 References
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3013347@arforms-form-builder/trunk&old=2998602@arforms-form-builder/trunk&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/6e349cae-a996-4a32-807a-a98ebcb01edd?source=cve
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3013347@arforms-form-builder/trunk&old=2998602@arforms-form-builder/trunk&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/6e349cae-a996-4a32-807a-a98ebcb01edd?source=cve
