CVE-2022-31257
📋 TL;DR
This vulnerability in Mendix applications allows attackers with access to an active user session to change that user's password without proper validation, potentially setting weak passwords. It affects Mendix applications built with vulnerable versions of Mendix 7, 8, and 9. The vulnerability requires session access but bypasses password policy enforcement.
💻 Affected Systems
- Mendix Applications
📦 What is this software?
Mendix by Mendix
Mendix by Mendix
Mendix by Mendix
Mendix by Mendix
Mendix by Mendix
⚠️ Risk & Real-World Impact
Worst Case
Attackers could compromise administrative accounts, gain full application control, and potentially pivot to other systems if the same credentials are reused elsewhere.
Likely Case
Attackers with session access could change passwords for regular users, causing account lockouts or unauthorized access to sensitive application data.
If Mitigated
With proper session management and monitoring, impact is limited to individual compromised sessions rather than systemic compromise.
🎯 Exploit Status
Requires access to an active user session. Once session access is obtained, exploitation is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Mendix 7.23.31, 8.18.18, 9.14.0, 9.12.2, or 9.6.12
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-433782.pdf
Restart Required: Yes
Instructions:
1. Update Mendix Studio Pro to patched version. 2. Redeploy affected applications with updated runtime. 3. Restart application services. 4. Verify application functionality post-update.
🔧 Temporary Workarounds
Session Timeout Reduction
allReduce session timeout durations to limit window for exploitation
Configure in Mendix application settings: Session timeout = 15 minutes or less
Password Policy Enforcement
allImplement additional password validation at application layer
Add custom password validation microflow in Mendix Studio Pro
🧯 If You Can't Patch
- Implement strict session management with short timeouts and forced re-authentication for sensitive operations
- Deploy WAF rules to detect and block suspicious password change patterns
🔍 How to Verify
Check if Vulnerable:
Check Mendix application version in Mendix Studio Pro or application metadata. Compare against affected version ranges.Check Version:
Check Mendix model version in .mpr file or runtime version in application logsVerify Fix Applied:
Verify application is running patched Mendix runtime version and test password change functionality with weak passwords to ensure validation works.📡 Detection & Monitoring
Log Indicators:
- Multiple password change attempts for same user
- Password changes without proper validation events
- Session hijacking patterns
Network Indicators:
- Unusual password change requests from unexpected locations
- Session token reuse patterns
SIEM Query:
source="mendix-logs" AND (event="password_change" AND validation="bypassed") OR (session_id COUNT > threshold)