CVE-2022-50680
📋 TL;DR
A stored cross-site scripting vulnerability in Kentico Xperience allows authenticated administration users to inject malicious scripts into email marketing templates. When these templates are rendered, the scripts execute in victims' browsers, potentially compromising user sessions and stealing sensitive information. This affects Kentico Xperience installations with email marketing functionality.
💻 Affected Systems
- Kentico Xperience
📦 What is this software?
Xperience by Kentico
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, compromise user accounts, redirect users to malicious sites, or perform actions on behalf of authenticated users, leading to complete system compromise.
Likely Case
Attackers with administrative access could embed malicious scripts in email templates that execute when users view emails, potentially stealing session cookies or redirecting to phishing sites.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before execution, preventing successful exploitation.
🎯 Exploit Status
Exploitation requires administrative privileges to access email template editing functionality
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Hotfix available via Kentico DevNet
Vendor Advisory: https://devnet.kentico.com/download/hotfixes
Restart Required: Yes
Instructions:
1. Download the appropriate hotfix from Kentico DevNet. 2. Apply the hotfix according to Kentico's installation instructions. 3. Restart the application/services. 4. Verify the fix by testing email template functionality.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit access to email marketing template editing to only essential, trusted administrators
Implement Content Security Policy
allAdd CSP headers to restrict script execution in email rendering contexts
🧯 If You Can't Patch
- Implement strict input validation and output encoding for all email template fields
- Disable email marketing functionality until patch can be applied
🔍 How to Verify
Check if Vulnerable:
Test if unescaped HTML/JavaScript can be saved in email marketing templates and executes when renderedCheck Version:
Check Kentico Xperience version in administration interface or web.configVerify Fix Applied:
Attempt to inject script payloads into email templates and verify they are properly sanitized/escaped📡 Detection & Monitoring
Log Indicators:
- Unusual email template modifications
- Administrative account activity at unusual times
- Script tags or JavaScript in email template content
Network Indicators:
- Outbound connections from email rendering to unexpected domains
- Suspicious script sources in email content
SIEM Query:
Search for email template modification events followed by unusual script execution or network activity