CVE-2024-35761
📋 TL;DR
This stored XSS vulnerability in the vCita Online Booking & Scheduling Calendar WordPress plugin allows attackers to inject malicious scripts into web pages. When users view affected pages, the scripts execute in their browsers, potentially stealing session cookies or performing actions on their behalf. All WordPress sites using vulnerable versions of this plugin 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 session cookies, take over WordPress sites, deface websites, or redirect visitors to malicious sites.
Likely Case
Attackers inject malicious scripts to steal user session data, perform actions as authenticated users, or redirect users to phishing pages.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users' browsers.
🎯 Exploit Status
Stored XSS vulnerabilities are commonly exploited, though specific exploit details for this CVE aren't publicly documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.4.1 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Online Booking & Scheduling Calendar for WordPress by vcita'. 4. Click 'Update Now' if update is available. 5. Alternatively, download version 4.4.1+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily disable the plugin until patched
wp plugin deactivate meeting-scheduler-by-vcita
Implement WAF rules
allAdd XSS protection rules to web application firewall
🧯 If You Can't Patch
- Disable the vCita plugin completely until patching is possible
- Implement strict Content Security Policy (CSP) headers to mitigate XSS impact
🔍 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 4.4.1 or higher in WordPress admin📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints
- Suspicious script tags in form submissions
Network Indicators:
- Malicious script payloads in HTTP requests
- Unexpected redirects from booking pages
SIEM Query:
source="wordpress" AND (plugin="vcita" OR plugin="meeting-scheduler") AND (method="POST" OR status=200) AND (uri CONTAINS "/wp-admin/" OR uri CONTAINS "vcita")🔗 References
- https://patchstack.com/database/vulnerability/meeting-scheduler-by-vcita/wordpress-online-booking-scheduling-calendar-for-wordpress-by-vcita-plugin-4-4-0-cross-site-scripting-xss-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/meeting-scheduler-by-vcita/wordpress-online-booking-scheduling-calendar-for-wordpress-by-vcita-plugin-4-4-0-cross-site-scripting-xss-vulnerability?_s_id=cve
