CVE-2025-64227
📋 TL;DR
This CVE describes a PHP object injection vulnerability in the Client Invoicing by Sprout Invoices WordPress plugin. Attackers can exploit insecure deserialization to execute arbitrary code, potentially compromising the entire WordPress site. All WordPress installations using affected versions of this plugin are vulnerable.
💻 Affected Systems
- Client Invoicing by Sprout Invoices 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 server compromise, data theft, malware deployment, and persistent backdoor installation.
Likely Case
Website defacement, data exfiltration, privilege escalation, and installation of malicious plugins/themes.
If Mitigated
Limited impact if proper web application firewalls and input validation are in place, but still significant risk.
🎯 Exploit Status
Deserialization vulnerabilities are commonly exploited with publicly available tools. The Patchstack reference indicates detailed technical analysis exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 20.8.8 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Client Invoicing by Sprout Invoices'. 4. Click 'Update Now' if available. 5. Alternatively, download latest version from WordPress.org and replace plugin files.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily deactivate the plugin until patched
wp plugin deactivate sprout-invoices
Web Application Firewall rule
allBlock deserialization attempts at WAF level
🧯 If You Can't Patch
- Remove plugin completely and use alternative invoicing solution
- Implement strict network segmentation to isolate WordPress instance
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Client Invoicing by Sprout Invoices > Version. If version is 20.8.7 or lower, you are vulnerable.Check Version:
wp plugin get sprout-invoices --field=versionVerify Fix Applied:
Confirm plugin version is 20.8.8 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints
- Deserialization errors in PHP logs
- Unexpected file creation in wp-content/uploads
Network Indicators:
- HTTP requests containing serialized PHP objects
- Traffic to known exploit patterns for CVE-2025-64227
SIEM Query:
source="wordpress.log" AND ("sprout-invoices" OR "CVE-2025-64227") AND ("deserialization" OR "unserialize" OR "object injection")