CVE-2024-58321
📋 TL;DR
A stored cross-site scripting vulnerability in Kentico Xperience allows attackers to inject malicious scripts via form validation rule configuration. This enables execution of arbitrary JavaScript in users' browsers when they interact with affected forms. Organizations using vulnerable Kentico Xperience versions are affected.
💻 Affected Systems
- Kentico Xperience
📦 What is this software?
Xperience by Kentico
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal user session cookies, perform actions as authenticated users, redirect to malicious sites, or deploy malware through browser exploitation.
Likely Case
Attackers would typically steal session cookies to hijack user accounts, perform phishing attacks, or deface website content.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching user browsers.
🎯 Exploit Status
Exploitation requires ability to configure form validation rules; typically requires authenticated access with appropriate permissions
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Kentico hotfixes at provided URL for specific version
Vendor Advisory: https://devnet.kentico.com/download/hotfixes
Restart Required: Yes
Instructions:
1. Visit https://devnet.kentico.com/download/hotfixes 2. Download appropriate hotfix for your Kentico Xperience version 3. Apply hotfix following Kentico documentation 4. Restart application/services
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation on form validation rule configuration to sanitize script tags and JavaScript content
Output Encoding
allEnsure all form validation rule outputs are properly HTML-encoded before rendering in user browsers
🧯 If You Can't Patch
- Restrict access to form validation rule configuration to trusted administrators only
- Implement web application firewall rules to detect and block XSS payloads in form submissions
🔍 How to Verify
Check if Vulnerable:
Test form validation rule configuration by attempting to inject JavaScript payloads and checking if they execute in user browsersCheck Version:
Check Kentico administration interface or web.config for version informationVerify Fix Applied:
After applying patch, attempt same XSS payload injection and verify scripts are properly sanitized/encoded📡 Detection & Monitoring
Log Indicators:
- Unusual form validation rule modifications
- Administrative account activity creating/modifying validation rules with script-like content
Network Indicators:
- HTTP requests containing JavaScript payloads in form validation parameters
SIEM Query:
source="web_logs" AND ("form validation" OR "validation rule") AND ("script" OR "javascript" OR "onload" OR "onerror")