CVE-2022-50681
📋 TL;DR
CVE-2022-50681 is a reflected cross-site scripting vulnerability in Kentico Xperience's Rich Text Editor component that allows attackers to inject malicious scripts via administration input fields. This vulnerability affects Kentico Xperience administrators who use the vulnerable Rich Text Editor component. Successful exploitation allows attackers to execute arbitrary JavaScript in victims' browsers.
💻 Affected Systems
- Kentico Xperience
📦 What is this software?
Xperience by Kentico
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, perform actions as authenticated administrators, redirect users to malicious sites, or install malware via the browser.
Likely Case
Attackers would typically steal session cookies to gain unauthorized administrative access, potentially leading to website defacement, data theft, or further system compromise.
If Mitigated
With proper input validation and output encoding, the malicious scripts would be rendered harmless as text rather than executable code.
🎯 Exploit Status
Exploitation requires attacker to trick authenticated administrator into clicking a malicious link or visiting a crafted page
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Hotfixes available for multiple versions - check Kentico DevNet
Vendor Advisory: https://devnet.kentico.com/download/hotfixes
Restart Required: Yes
Instructions:
1. Download appropriate hotfix from Kentico DevNet. 2. Apply hotfix according to Kentico documentation. 3. Restart application/services. 4. Verify fix by testing Rich Text Editor input fields.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement server-side input validation and proper output encoding for all Rich Text Editor inputs
Content Security Policy
allImplement strict Content Security Policy headers to mitigate XSS impact
Content-Security-Policy: default-src 'self'; script-src 'self'
🧯 If You Can't Patch
- Restrict access to administration interface to trusted IP addresses only
- Implement web application firewall rules to block XSS payloads in Rich Text Editor inputs
🔍 How to Verify
Check if Vulnerable:
Test Rich Text Editor input fields with XSS payloads like <script>alert('XSS')</script> and check if script executesCheck Version:
Check Kentico Xperience version in administration interface or web.config fileVerify Fix Applied:
After applying hotfix, test same XSS payloads to confirm they are properly sanitized and don't execute📡 Detection & Monitoring
Log Indicators:
- Unusual script tags or JavaScript in Rich Text Editor input logs
- Multiple failed login attempts followed by successful login from new location
Network Indicators:
- HTTP requests containing XSS payloads in Rich Text Editor parameters
- Unexpected outbound connections from administrator browsers
SIEM Query:
source="web_server" AND (uri="*RichTextEditor*" OR uri="*admin*" OR uri="*editor*") AND (content="*<script>*" OR content="*javascript:*" OR content="*onload=*" OR content="*onerror=*")