CVE-2023-53737
📋 TL;DR
A stored cross-site scripting vulnerability in Kentico Xperience allows global administrators to inject malicious scripts via the Localization application. This affects Kentico Xperience installations where administrators have access to the vulnerable interface. The injected scripts execute in the administration interface context, potentially affecting other administrators.
💻 Affected Systems
- Kentico Xperience
📦 What is this software?
Xperience by Kentico
⚠️ Risk & Real-World Impact
Worst Case
Malicious administrator could inject scripts that steal session cookies, perform actions as other administrators, or compromise the entire administration interface.
Likely Case
Privileged administrator could inject scripts affecting other administrators' sessions, leading to privilege escalation or data theft within the admin interface.
If Mitigated
Limited impact with proper administrator vetting and monitoring, though still allows admin-to-admin attacks.
🎯 Exploit Status
Requires authenticated global administrator access. Exploitation is straightforward once credentials are compromised.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Hotfixes available for multiple versions via Kentico DevNet
Vendor Advisory: https://devnet.kentico.com/download/hotfixes
Restart Required: Yes
Instructions:
1. Download appropriate hotfix from Kentico DevNet. 2. Backup current installation. 3. Apply hotfix according to Kentico documentation. 4. Restart application/services. 5. Verify fix by testing Localization application.
🔧 Temporary Workarounds
Restrict Localization Access
allLimit access to Localization application to only essential administrators
Input Validation
allImplement additional input validation/sanitization for Localization fields
🧯 If You Can't Patch
- Implement strict administrator access controls and monitoring
- Deploy web application firewall with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Test Localization application fields for XSS by attempting to inject script payloads as administratorCheck Version:
Check Kentico Xperience version in administration interface or web.configVerify Fix Applied:
After patching, attempt same XSS payloads in Localization application - scripts should be sanitized/blocked📡 Detection & Monitoring
Log Indicators:
- Unusual Localization application activity
- Multiple administrator login attempts
- Suspicious script-like strings in localization data
Network Indicators:
- Unexpected JavaScript execution in admin interface
- Suspicious outbound connections from admin sessions
SIEM Query:
source="kentico" AND (event="localization_edit" OR event="admin_action") AND (message="*script*" OR message="*alert*" OR message="*onload*")