CVE-2025-4579
📋 TL;DR
The WP Content Security Plugin for WordPress has a stored cross-site scripting vulnerability in versions up to 2.3. Unauthenticated attackers can inject malicious scripts via blocked-uri and effective-directive parameters, which execute when users visit compromised pages. This affects all WordPress sites using the vulnerable plugin.
💻 Affected Systems
- WP Content Security Plugin for WordPress
⚠️ 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
Attackers could steal admin credentials, deface websites, redirect users to malicious sites, or install backdoors for persistent access.
Likely Case
Attackers inject malicious scripts to steal user session cookies, redirect to phishing sites, or display unwanted content.
If Mitigated
With proper input validation and output escaping, the vulnerability would be prevented, limiting impact to plugin functionality only.
🎯 Exploit Status
XSS vulnerabilities are commonly exploited, and unauthenticated access makes this particularly dangerous.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 2.3
Vendor Advisory: https://plugins.trac.wordpress.org/browser/wp-content-security-policy
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins. 3. Find WP Content Security Plugin. 4. Click 'Update Now' if available. 5. If no update, deactivate and delete the plugin, then install the latest version from WordPress repository.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily disable the WP Content Security Plugin until patched
wp plugin deactivate wp-content-security-policy
Implement WAF rules
allAdd web application firewall rules to block XSS payloads in blocked-uri and effective-directive parameters
🧯 If You Can't Patch
- Remove the plugin entirely and use alternative content security policy solutions
- Implement strict CSP headers at web server level to mitigate XSS impact
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > WP Content Security Plugin version. If version is 2.3 or lower, you are vulnerable.Check Version:
wp plugin get wp-content-security-policy --field=versionVerify Fix Applied:
After updating, verify the plugin version is higher than 2.3 in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to WP-CSP endpoints with script tags in parameters
- Multiple failed CSP violation reports with suspicious URIs
Network Indicators:
- HTTP requests containing <script> tags in blocked-uri or effective-directive parameters
- Outbound connections to suspicious domains from compromised pages
SIEM Query:
source="wordpress.log" AND ("blocked-uri" OR "effective-directive") AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")🔗 References
- https://plugins.trac.wordpress.org/browser/wp-content-security-policy/tags/2.3/includes/WP_CSP.php#L597
- https://plugins.trac.wordpress.org/browser/wp-content-security-policy/tags/2.3/includes/WP_CSP.php#L612
- https://plugins.trac.wordpress.org/browser/wp-content-security-policy/tags/2.3/includes/WP_CSP.php#L659
- https://www.wordfence.com/threat-intel/vulnerabilities/id/f3c4ba08-a9fa-439a-a887-b8c113f78e20?source=cve
