CVE-2025-23925
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the WordPress Feedburner Optin Form plugin allows attackers to inject malicious scripts into web pages. When exploited, these scripts execute in visitors' browsers, potentially stealing credentials, session cookies, or redirecting users to malicious sites. All WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- WordPress Feedburner Optin Form 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
Attackers could steal administrator credentials, take over the WordPress site, install backdoors, deface the website, or use the compromised site to attack visitors.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies or credentials, redirect users to phishing sites, or display unwanted advertisements.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users' browsers.
🎯 Exploit Status
XSS vulnerabilities are commonly exploited and toolkits exist for automated exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.2.9 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Feedburner Optin Form' and click 'Update Now'. 4. Verify update to version 0.2.9 or higher.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily deactivate the Feedburner Optin Form plugin until patched
wp plugin deactivate feedburner-optin-form
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Add to wp-config.php: header("Content-Security-Policy: default-src 'self'; script-src 'self'");
🧯 If You Can't Patch
- Remove the Feedburner Optin Form plugin completely from your WordPress installation
- Implement a web application firewall (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for Feedburner Optin Form version 0.2.8 or lowerCheck Version:
wp plugin get feedburner-optin-form --field=versionVerify Fix Applied:
Verify plugin version is 0.2.9 or higher in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints containing script tags or JavaScript
- Multiple failed login attempts following plugin access
Network Indicators:
- Outbound connections to suspicious domains from your WordPress server
- Unexpected JavaScript payloads in HTTP responses
SIEM Query:
source="wordpress.log" AND ("feedburner-optin-form" OR "Feedburner") AND ("<script>" OR "javascript:" OR "onload=" OR "onerror=")