CVE-2025-3867
📋 TL;DR
This CSRF vulnerability in the Ajax Comment Form CST WordPress plugin allows attackers to trick administrators into unknowingly changing plugin settings and injecting malicious scripts. All WordPress sites using this plugin up to version 1.2 are affected. Attackers can exploit this without authentication by crafting deceptive links.
💻 Affected Systems
- Ajax Comment Form CST WordPress Plugin
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Site takeover through persistent XSS payload injection, leading to credential theft, malware distribution, or complete site defacement.
Likely Case
Injection of malicious scripts that steal session cookies or redirect users to phishing sites, compromising user data and site integrity.
If Mitigated
No impact if proper CSRF protections are implemented or the plugin is disabled/removed.
🎯 Exploit Status
Exploitation requires social engineering to trick an administrator, but the technical execution is simple once the victim clicks the link.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://wordpress.org/plugins/ajax-comment-form-cst/
Restart Required: No
Instructions:
1. Remove the Ajax Comment Form CST plugin from your WordPress installation. 2. Delete the plugin files from /wp-content/plugins/ajax-comment-form-cst/. 3. Consider alternative comment form plugins with security updates.
🔧 Temporary Workarounds
Disable Plugin
allDeactivate the vulnerable plugin through WordPress admin panel to prevent exploitation.
Navigate to WordPress Admin > Plugins > Installed Plugins > Deactivate 'Ajax Comment Form CST'
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution sources
- Use browser extensions or network filtering to block malicious requests targeting the acform_cst_settings page
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Installed Plugins for 'Ajax Comment Form CST' with version 1.2 or lower.Check Version:
wp plugin list --name=ajax-comment-form-cst --field=version (if WP-CLI is installed)Verify Fix Applied:
Confirm the plugin is either removed or deactivated in the WordPress plugins list.📡 Detection & Monitoring
Log Indicators:
- POST requests to /wp-admin/admin.php?page=acform_cst_settings without proper nonce validation
- Unexpected changes to plugin settings
Network Indicators:
- HTTP requests with suspicious referer headers targeting the settings page
- CSRF payloads in web traffic
SIEM Query:
source="wordpress.log" AND (uri="/wp-admin/admin.php" AND query="page=acform_cst_settings")