CVE-2025-54677
📋 TL;DR
This vulnerability allows attackers to upload malicious files to WordPress sites using the vcita Online Booking & Scheduling Calendar plugin. Attackers can upload dangerous file types like PHP scripts, potentially leading to remote code execution. All WordPress sites with the vulnerable plugin versions are affected.
💻 Affected Systems
- Online Booking & Scheduling Calendar for WordPress by vcita
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete site takeover via remote code execution, data theft, malware distribution, and server compromise.
Likely Case
Website defacement, backdoor installation, credential theft, and unauthorized access to the WordPress installation.
If Mitigated
Limited impact with proper file upload restrictions, web application firewalls, and file integrity monitoring in place.
🎯 Exploit Status
Simple file upload exploitation with publicly available proof-of-concept code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.5.4 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Online Booking & Scheduling Calendar by vcita'. 4. Click 'Update Now' if available. 5. Alternatively, download latest version from WordPress repository and replace plugin files.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily deactivate the plugin until patched
wp plugin deactivate meeting-scheduler-by-vcita
Restrict file uploads via .htaccess
linuxBlock execution of uploaded files in uploads directory
Add to .htaccess in wp-content/uploads: <Files *.php> deny from all </Files>
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block malicious file uploads
- Enable file integrity monitoring on WordPress uploads directory
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Installed Plugins for 'Online Booking & Scheduling Calendar by vcita' version 4.5.3 or earlierCheck Version:
wp plugin get meeting-scheduler-by-vcita --field=versionVerify Fix Applied:
Verify plugin version is 4.5.4 or higher in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to wp-content/uploads/
- POST requests to plugin upload endpoints
- Execution of PHP files from uploads directory
Network Indicators:
- HTTP POST requests with file uploads to /wp-content/plugins/meeting-scheduler-by-vcita/ endpoints
SIEM Query:
source="web_server" AND (uri_path="/wp-content/plugins/meeting-scheduler-by-vcita/" AND method="POST" AND file_upload="true")