CVE-2025-39500
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code through PHP object injection via deserialization of untrusted data in the Goodlayers Hostel WordPress plugin. All WordPress sites running affected versions of this plugin are vulnerable to exploitation.
💻 Affected Systems
- Goodlayers Hostel 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, and persistent backdoor installation.
Likely Case
Unauthenticated attackers gaining administrative access to WordPress sites, installing malware, or defacing websites.
If Mitigated
Limited impact if proper input validation and output encoding are implemented, though deserialization vulnerabilities remain dangerous.
🎯 Exploit Status
CVSS 9.8 indicates critical severity with low attack complexity. Public exploit details exist in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 3.1.3 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Goodlayers Hostel' plugin. 4. Click 'Update Now' if update is available. 5. If no update appears, manually download version 3.1.3+ from WordPress repository and replace plugin files.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily deactivate the vulnerable plugin until patched.
wp plugin deactivate gdlr-hostel
Restrict Access
allUse web application firewall to block requests to vulnerable endpoints.
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user-supplied data
- Deploy web application firewall with rules specifically blocking deserialization attacks
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins for Goodlayers Hostel version. If version is 3.1.2 or lower, system is vulnerable.Check Version:
wp plugin get gdlr-hostel --field=versionVerify Fix Applied:
After update, verify plugin version shows 3.1.3 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints
- PHP serialized data in request parameters
- Unexpected file uploads or system command execution
Network Indicators:
- HTTP requests containing serialized PHP objects (O:8:"stdClass":)
- Traffic to known exploit paths for this vulnerability
SIEM Query:
source="web_logs" AND (uri_path="*gdlr-hostel*" OR user_agent="*exploit*") AND (http_method="POST" OR parameters="*O:8:*")