CVE-2025-5392
📋 TL;DR
The GB Forms DB WordPress plugin has a critical remote code execution vulnerability that allows unauthenticated attackers to execute arbitrary code on affected servers. This affects all WordPress sites using GB Forms DB version 1.0.2 or earlier. Attackers can leverage this to install backdoors, create admin accounts, or take full control of the server.
💻 Affected Systems
- GB Forms DB 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
Complete server compromise leading to data theft, ransomware deployment, or use as part of a botnet
Likely Case
Backdoor installation and administrative account creation leading to persistent access and data exfiltration
If Mitigated
Limited impact due to proper network segmentation and least privilege controls
🎯 Exploit Status
Simple exploitation via call_user_func() with user-controlled input makes this easily weaponizable
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.3 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3323703%40gb-forms-db&new=3323703%40gb-forms-db&sfp_email=&sfph_mail=
Restart Required: No
Instructions:
1. Log into WordPress admin panel
2. Navigate to Plugins → Installed Plugins
3. Find GB Forms DB and update to version 1.0.3 or later
4. Verify update completed successfully
🔧 Temporary Workarounds
Disable GB Forms DB Plugin
allTemporarily disable the vulnerable plugin until patching is possible
wp plugin deactivate gb-forms-db
Web Application Firewall Rule
allBlock requests to the vulnerable gbfdb_talk_to_front() function
Add WAF rule to block requests containing 'gbfdb_talk_to_front' in URL or parameters
🧯 If You Can't Patch
- Remove GB Forms DB plugin completely from all WordPress installations
- Implement strict network segmentation and limit WordPress server internet access
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → GB Forms DB version. If version is 1.0.2 or earlier, system is vulnerable.Check Version:
wp plugin list --name=gb-forms-db --field=versionVerify Fix Applied:
Verify GB Forms DB plugin version is 1.0.3 or later in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- POST requests to /wp-admin/admin-ajax.php with 'action=gbfdb_talk_to_front'
- Unusual PHP execution patterns in web server logs
- New admin user creation in WordPress logs
Network Indicators:
- Outbound connections to suspicious IPs from WordPress server
- Unusual spikes in traffic to admin-ajax.php
SIEM Query:
source="web_server_logs" AND (uri="/wp-admin/admin-ajax.php" AND parameters CONTAINS "gbfdb_talk_to_front")🔗 References
- https://plugins.trac.wordpress.org/browser/gb-forms-db/trunk/core/functions.php#L334
- https://plugins.trac.wordpress.org/browser/gb-forms-db/trunk/core/functions.php#L367
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3323703%40gb-forms-db&new=3323703%40gb-forms-db&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/fe8723a7-bbb1-41a0-b222-3cf4eb44cd64?source=cve
