CVE-2025-23806
📋 TL;DR
A Cross-Site Request Forgery (CSRF) vulnerability in the ThemeFarmer Ultimate Subscribe WordPress plugin allows attackers to trick authenticated administrators into performing actions that lead to reflected cross-site scripting (XSS). This affects WordPress sites using Ultimate Subscribe plugin versions up to 1.3. Attackers can inject malicious scripts that execute in administrators' browsers.
💻 Affected Systems
- ThemeFarmer Ultimate Subscribe 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
Attackers could steal administrator session cookies, perform administrative actions on the WordPress site, or redirect users to malicious sites, potentially leading to complete site compromise.
Likely Case
Attackers would typically use this to inject malicious JavaScript that steals administrator credentials or performs unauthorized administrative actions when an admin visits a crafted malicious page.
If Mitigated
With proper CSRF protections and content security policies, the impact would be limited to failed exploitation attempts with no successful payload execution.
🎯 Exploit Status
Exploitation requires social engineering to trick an authenticated administrator into clicking a malicious link. The CSRF leads to reflected XSS execution in the administrator's context.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 1.3
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Locate 'Ultimate Subscribe' plugin. 4. Check for available updates. 5. Update to the latest version (above 1.3). 6. Verify the plugin is active and functioning.
🔧 Temporary Workarounds
Disable Ultimate Subscribe Plugin
WordPressTemporarily disable the vulnerable plugin until patched
wp plugin deactivate ultimate-subscribe
Implement CSRF Protection Headers
allAdd Content Security Policy headers to mitigate XSS impact
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Add to nginx config: add_header Content-Security-Policy "default-src 'self'; script-src 'self'";
🧯 If You Can't Patch
- Remove Ultimate Subscribe plugin completely if not essential
- Implement strict network segmentation to limit admin panel access to trusted IPs only
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for Ultimate Subscribe version. If version is 1.3 or lower, you are vulnerable.Check Version:
wp plugin get ultimate-subscribe --field=versionVerify Fix Applied:
After updating, verify Ultimate Subscribe plugin version is above 1.3 in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to Ultimate Subscribe admin endpoints
- Multiple failed CSRF token validations
- Suspicious referrer headers in admin panel access logs
Network Indicators:
- Unexpected JavaScript payloads in HTTP requests to Ultimate Subscribe endpoints
- Admin panel access from unusual IP addresses
SIEM Query:
source="wordpress.log" AND ("ultimate-subscribe" OR "ultimate_subscribe") AND ("POST" OR "admin-ajax.php") AND (status=200 OR status=302)