CVE-2025-66055
📋 TL;DR
This vulnerability allows attackers to inject malicious objects through deserialization of untrusted data in the Icegram Email Subscribers & Newsletters WordPress plugin. Successful exploitation could lead to remote code execution or other malicious activities. All WordPress sites using affected versions of this plugin are vulnerable.
💻 Affected Systems
- Icegram Email Subscribers & Newsletters 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
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Unauthenticated attackers achieving remote code execution to install backdoors, deface websites, or steal sensitive data.
If Mitigated
Attackers blocked by proper input validation and deserialization controls, preventing object injection.
🎯 Exploit Status
Deserialization vulnerabilities are commonly exploited and public details exist.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 5.9.10
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Email Subscribers & Newsletters'. 4. Click 'Update Now' if available. 5. Alternatively, download latest version from WordPress repository and replace plugin files.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily disable the plugin until patched
wp plugin deactivate email-subscribers
Restrict plugin access
allUse web application firewall to block requests to vulnerable endpoints
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all plugin inputs
- Deploy web application firewall with deserialization attack protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins for 'Email Subscribers & Newsletters' version ≤5.9.10Check Version:
wp plugin get email-subscribers --field=versionVerify Fix Applied:
Verify plugin version is >5.9.10 in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints
- PHP deserialization errors in logs
- Unexpected file creation in wp-content/uploads
Network Indicators:
- HTTP requests containing serialized PHP objects
- Traffic to known exploit patterns for this CVE
SIEM Query:
source="web_server" AND (uri_path="*/email-subscribers/*" OR user_agent="*exploit*") AND status_code=200