CVE-2025-22390
📋 TL;DR
This vulnerability allows attackers to compromise user accounts through password attacks due to weak password requirements in Optimizely EPiServer CMS. Organizations using affected versions are at risk of unauthorized access to their content management systems. The vulnerability affects all users who can set passwords through the CMS interface.
💻 Affected Systems
- Optimizely EPiServer CMS Core
📦 What is this software?
Optimizely Cms by Optimizely
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of CMS administrator accounts leading to data theft, content manipulation, or lateral movement to other systems.
Likely Case
Successful password spraying attacks against user accounts resulting in unauthorized access to CMS functionality.
If Mitigated
Limited impact with strong additional authentication controls like MFA and account lockout policies in place.
🎯 Exploit Status
Exploitation requires valid user accounts to target and knowledge of password spraying techniques. No authentication bypass is involved.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 12.32.0 or later
Vendor Advisory: https://support.optimizely.com/hc/en-us/articles/33182255281293-Content-Management-System-CMS-Security-Advisory-CMS-2025-02
Restart Required: No
Instructions:
1. Backup CMS database and files. 2. Upgrade to EPiServer.CMS.Core version 12.32.0 or later. 3. Test functionality after upgrade. 4. Consider forcing password resets for all users.
🔧 Temporary Workarounds
Implement Strong Password Policy
allConfigure custom password policy requiring minimum 12 characters with complexity requirements
Enable Multi-Factor Authentication
allRequire MFA for all CMS user accounts to add additional authentication layer
🧯 If You Can't Patch
- Implement account lockout policies after failed login attempts
- Monitor for password spraying attempts and enforce regular password changes
🔍 How to Verify
Check if Vulnerable:
Check EPiServer.CMS.Core assembly version in bin folder or via CMS admin interfaceCheck Version:
Get-ChildItem "C:\inetpub\wwwroot\bin\EPiServer.CMS.Core.dll" | Select-Object VersionInfoVerify Fix Applied:
Verify version is 12.32.0 or later and test password complexity enforcement📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts from single IP
- Successful logins after many failures
- Password change events
Network Indicators:
- HTTP POST requests to login endpoints with varying credentials
- Unusual authentication traffic patterns
SIEM Query:
source="CMS_Logs" (event_type="login_failure" AND count > 10) BY src_ip WITHIN 5m