CVE-2025-49393
📋 TL;DR
This vulnerability allows attackers to inject malicious objects through deserialization of untrusted data in the Fetch Designs Sign-up Sheets WordPress plugin. Successful exploitation could lead to remote code execution or data manipulation. All WordPress sites running vulnerable versions of this plugin are affected.
💻 Affected Systems
- Fetch Designs Sign-up Sheets 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 website defacement.
Likely Case
Unauthenticated attackers executing arbitrary PHP code, potentially gaining administrative access to the WordPress site.
If Mitigated
Limited impact if proper input validation and output encoding are implemented elsewhere in the application.
🎯 Exploit Status
CVSS 9.8 indicates critical severity with low attack complexity and no authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.3 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Sign-up Sheets' and click 'Update Now'. 4. Verify update to version 2.3.3 or higher.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patching is possible.
wp plugin deactivate sign-up-sheets
Restrict Access
allUse web application firewall rules to block requests to vulnerable endpoints.
🧯 If You Can't Patch
- Remove the plugin entirely if not essential for business operations
- Implement strict network segmentation to isolate affected systems
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Sign-up Sheets version numberCheck Version:
wp plugin get sign-up-sheets --field=versionVerify Fix Applied:
Confirm plugin version is 2.3.3 or higher in WordPress admin📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to sign-up-sheets endpoints
- PHP error logs showing unserialize() warnings
Network Indicators:
- HTTP requests with serialized PHP objects in parameters
- Unexpected outbound connections from web server
SIEM Query:
source="web_logs" AND uri="*sign-up-sheets*" AND (method="POST" OR params="*O:*")