CVE-2025-39550
📋 TL;DR
CVE-2025-39550 is a PHP object injection vulnerability in the Shahjahan Jewel FluentCommunity WordPress plugin that allows attackers to execute arbitrary code through deserialization of untrusted data. This affects all WordPress sites running FluentCommunity versions up to 1.2.15. Attackers can potentially gain complete control of affected websites.
💻 Affected Systems
- Shahjahan Jewel FluentCommunity 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 website compromise, data theft, malware installation, and server takeover.
Likely Case
Website defacement, backdoor installation, credential theft, and data exfiltration.
If Mitigated
Limited impact if proper web application firewalls and input validation are in place, though risk remains elevated.
🎯 Exploit Status
Exploitation requires sending specially crafted requests to vulnerable endpoints. Public proof-of-concept code exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.16 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find FluentCommunity plugin. 4. Click 'Update Now' if update available. 5. If no update available, deactivate and delete plugin, then install fresh version from WordPress repository.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the FluentCommunity plugin until patched version is available.
wp plugin deactivate fluent-community
Web Application Firewall Rule
allBlock requests containing serialized PHP objects to vulnerable endpoints.
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user inputs
- Deploy web application firewall with rules to detect and block deserialization attacks
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins for FluentCommunity version. If version is 1.2.15 or lower, system is vulnerable.Check Version:
wp plugin get fluent-community --field=versionVerify Fix Applied:
Verify FluentCommunity plugin version is 1.2.16 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to FluentCommunity endpoints
- PHP error logs showing unserialize() warnings
- Unexpected file creation in wp-content/uploads
Network Indicators:
- HTTP requests containing serialized PHP objects (O: or a: patterns)
- Traffic to known exploit paths for FluentCommunity
SIEM Query:
source="web_logs" AND (uri_path="/wp-content/plugins/fluent-community/" OR user_agent CONTAINS "fluentcommunity") AND (http_method="POST" OR request_body CONTAINS "O:" OR request_body CONTAINS "a:")