CVE-2023-2298
📋 TL;DR
This stored XSS vulnerability in the vcita WordPress plugin allows unauthenticated attackers to inject malicious JavaScript via the 'business_id' parameter. The injected scripts execute whenever users access compromised pages, potentially affecting all visitors to vulnerable WordPress sites. WordPress administrators using the plugin versions up to 4.2.10 are affected.
💻 Affected Systems
- Online Booking & Scheduling Calendar for WordPress by vcita
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, deface websites, redirect users to malicious sites, or install backdoors for persistent access.
Likely Case
Session hijacking, credential theft from users, and website defacement through injected malicious scripts.
If Mitigated
With proper input validation and output escaping, the vulnerability would be prevented entirely.
🎯 Exploit Status
The vulnerability requires no authentication and has public technical details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.2.11 or later
Vendor Advisory: https://wordpress.org/plugins/meeting-scheduler-by-vcita/#developers
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins. 3. Find 'Online Booking & Scheduling Calendar for WordPress by vcita'. 4. Click 'Update Now' if available. 5. Alternatively, download version 4.2.11+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the vulnerable plugin until patched
wp plugin deactivate meeting-scheduler-by-vcita
Web Application Firewall Rule
allBlock requests containing malicious script patterns in business_id parameter
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to limit script execution
- Use web application firewall to filter malicious input patterns
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for 'Online Booking & Scheduling Calendar for WordPress by vcita' versionCheck Version:
wp plugin get meeting-scheduler-by-vcita --field=versionVerify Fix Applied:
Verify plugin version is 4.2.11 or higher in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to vcita endpoints with script tags in parameters
- Multiple failed injection attempts in web server logs
Network Indicators:
- HTTP requests containing <script> tags in business_id parameter
- Unusual outbound connections from WordPress site after page visits
SIEM Query:
source="web_server" AND ("business_id" AND ("<script>" OR "javascript:" OR "onerror="))🔗 References
- https://blog.jonh.eu/blog/security-vulnerabilities-in-wordpress-plugins-by-vcita
- https://plugins.trac.wordpress.org/browser/meeting-scheduler-by-vcita/trunk/vcita-api-functions.php
- https://www.wordfence.com/threat-intel/vulnerabilities/id/7e6a0bf9-4767-4d4c-9a1e-adcb3c7719d9?source=cve
- https://blog.jonh.eu/blog/security-vulnerabilities-in-wordpress-plugins-by-vcita
- https://plugins.trac.wordpress.org/browser/meeting-scheduler-by-vcita/trunk/vcita-api-functions.php
- https://www.wordfence.com/threat-intel/vulnerabilities/id/7e6a0bf9-4767-4d4c-9a1e-adcb3c7719d9?source=cve
