CVE-2023-50851
📋 TL;DR
This SQL injection vulnerability in the Simply Schedule Appointments WordPress plugin allows attackers to execute arbitrary SQL commands on the database. It affects all WordPress sites using vulnerable versions of this appointment booking plugin, potentially compromising appointment data and the underlying database.
💻 Affected Systems
- Simply Schedule Appointments Booking Plugin for WordPress
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, modification, or deletion; potential privilege escalation to WordPress admin; possible server takeover if database permissions allow.
Likely Case
Unauthorized access to appointment data, customer information, and potentially other WordPress database tables; data exfiltration or manipulation.
If Mitigated
Limited impact with proper input validation and database user restrictions; potential for data viewing but not modification.
🎯 Exploit Status
SQL injection vulnerabilities are commonly weaponized; unauthenticated access makes exploitation easier.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.6.6.1
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Simply Schedule Appointments'. 4. Click 'Update Now' if available. 5. Alternatively, download version 1.6.6.1+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patching is possible
wp plugin deactivate simply-schedule-appointments
Web Application Firewall Rules
allImplement WAF rules to block SQL injection patterns targeting the plugin
🧯 If You Can't Patch
- Implement strict input validation and parameterized queries at application level
- Restrict database user permissions to minimum required for plugin functionality
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Simply Schedule Appointments → Version numberCheck Version:
wp plugin get simply-schedule-appointments --field=versionVerify Fix Applied:
Confirm plugin version is 1.6.6.1 or higher in WordPress admin📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed SQL injection attempts in web server logs
- Unexpected database errors related to appointment functions
Network Indicators:
- HTTP requests with SQL injection payloads to appointment-related endpoints
- Unusual database connection patterns from web server
SIEM Query:
source="web_logs" AND (uri="*simply-schedule-appointments*" AND (request="*UNION*" OR request="*SELECT*" OR request="*INSERT*" OR request="*DELETE*" OR request="*' OR '1'='1*"))🔗 References
- https://patchstack.com/database/vulnerability/simply-schedule-appointments/wordpress-simply-schedule-appointments-booking-plugin-1-6-6-1-sql-injection-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/simply-schedule-appointments/wordpress-simply-schedule-appointments-booking-plugin-1-6-6-1-sql-injection-vulnerability?_s_id=cve
