CVE-2024-4400
📋 TL;DR
This stored XSS vulnerability in the BoldGrid Post and Page Builder WordPress plugin allows authenticated attackers with contributor-level permissions or higher to inject malicious scripts into website pages. When users visit compromised pages, the scripts execute in their browsers, potentially stealing credentials or performing unauthorized actions. WordPress sites using vulnerable plugin versions are affected.
💻 Affected Systems
- Post and Page Builder by BoldGrid – Visual Drag and Drop Editor
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, deface websites, redirect visitors to malicious sites, or install backdoors for persistent access.
Likely Case
Attackers with contributor access inject malicious scripts to steal user session cookies or credentials, potentially escalating privileges.
If Mitigated
With proper input validation and output escaping, malicious scripts are neutralized before reaching users' browsers.
🎯 Exploit Status
Requires authenticated access with contributor permissions or higher. The vulnerability is in an unknown parameter with insufficient sanitization.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.26.5
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3087230/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Post and Page Builder by BoldGrid' and click 'Update Now'. 4. Verify version is 1.26.5 or higher.
🔧 Temporary Workarounds
Remove Contributor Access
allTemporarily revoke contributor-level permissions from untrusted users to prevent exploitation.
Disable Plugin
allDeactivate the vulnerable plugin until patched, but this may break site functionality.
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to limit script execution.
- Use web application firewall (WAF) rules to block XSS payloads in plugin parameters.
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for 'Post and Page Builder by BoldGrid' version 1.26.4 or lower.Check Version:
wp plugin list --name='post-and-page-builder' --field=versionVerify Fix Applied:
Confirm plugin version is 1.26.5 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints with script-like payloads in parameters.
- Multiple page edits by contributor-level users in short timeframes.
Network Indicators:
- Inbound requests containing JavaScript payloads to plugin-specific URLs.
SIEM Query:
source="wordpress.log" AND ("post-and-page-builder" OR "boldgrid") AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")🔗 References
- https://plugins.trac.wordpress.org/changeset/3087230/
- https://www.wordfence.com/threat-intel/vulnerabilities/id/9bb6683a-b8e6-4776-880f-5b48966fc5c6?source=cve
- https://plugins.trac.wordpress.org/changeset/3087230/
- https://www.wordfence.com/threat-intel/vulnerabilities/id/9bb6683a-b8e6-4776-880f-5b48966fc5c6?source=cve
