CVE-2026-24523
📋 TL;DR
This vulnerability in the WP FullCalendar WordPress plugin allows unauthorized users to retrieve embedded sensitive system information. It affects all WordPress sites running WP FullCalendar version 1.6 or earlier. The exposure occurs through improper access controls in the plugin's data handling.
💻 Affected Systems
- WP FullCalendar 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
Attackers could extract sensitive WordPress configuration data, database credentials, or other embedded information that could lead to full site compromise.
Likely Case
Unauthenticated attackers accessing exposed plugin endpoints to gather system information for reconnaissance and potential further attacks.
If Mitigated
With proper web application firewalls and access controls, the exposure would be blocked before reaching vulnerable endpoints.
🎯 Exploit Status
The vulnerability involves accessing specific endpoints without authentication to retrieve sensitive data.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 1.6
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find WP FullCalendar. 4. Click 'Update Now' if update available. 5. If no update, deactivate and remove plugin.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily deactivate WP FullCalendar plugin until patched version is available
Web Application Firewall Rule
allBlock access to vulnerable plugin endpoints using WAF
🧯 If You Can't Patch
- Implement strict access controls to block unauthorized access to plugin endpoints
- Monitor and alert on suspicious requests to WP FullCalendar plugin URLs
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for WP FullCalendar version 1.6 or earlierCheck Version:
wp plugin list --name=wp-fullcalendar --field=versionVerify Fix Applied:
Verify plugin version is greater than 1.6 or plugin is removed📡 Detection & Monitoring
Log Indicators:
- Unusual GET requests to /wp-content/plugins/wp-fullcalendar/ endpoints
- Multiple 200 responses to plugin URLs from unauthenticated users
Network Indicators:
- Traffic patterns showing data extraction from plugin endpoints
- Unusual outbound data transfers following plugin access
SIEM Query:
source="web_server" AND (uri="/wp-content/plugins/wp-fullcalendar/*" OR user_agent="*wp-fullcalendar*") AND response_code=200