CVE-2025-40758
📋 TL;DR
This vulnerability in Mendix SAML modules allows unauthenticated remote attackers to bypass signature validation and binding checks, potentially enabling account hijacking in specific SSO configurations. Affected organizations use Mendix SAML modules for authentication across Mendix 9.24, 10.12, and 10.21 compatible versions.
💻 Affected Systems
- Mendix SAML (Mendix 10.12 compatible)
- Mendix SAML (Mendix 10.21 compatible)
- Mendix SAML (Mendix 9.24 compatible)
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover of any user in vulnerable SSO configurations, leading to unauthorized access to sensitive applications and data.
Likely Case
Unauthenticated attackers hijack user sessions in misconfigured SSO environments, gaining access to application functionality and potentially sensitive information.
If Mitigated
With proper signature validation and binding checks enforced, authentication remains secure despite the vulnerability.
🎯 Exploit Status
Exploitation requires specific SSO configuration weaknesses and understanding of SAML protocol flaws.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V4.0.3 for Mendix 10.12 compatible, V4.1.2 for Mendix 10.21 compatible, V3.6.21 for Mendix 9.24 compatible
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-395458.html
Restart Required: Yes
Instructions:
1. Identify which Mendix SAML module version you're using. 2. Update to the patched version: V4.0.3 for Mendix 10.12 compatible, V4.1.2 for Mendix 10.21 compatible, or V3.6.21 for Mendix 9.24 compatible. 3. Restart the Mendix application. 4. Verify SSO functionality post-update.
🔧 Temporary Workarounds
Disable vulnerable SSO configurations
allTemporarily disable SAML-based SSO authentication until patching can be completed.
Configure Mendix application to use alternative authentication methods
Implement network-level restrictions
allRestrict access to SSO endpoints to trusted networks only.
Configure firewall rules to limit access to SAML assertion consumer service endpoints
🧯 If You Can't Patch
- Implement additional signature validation at the application layer
- Enable enhanced logging and monitoring for suspicious SSO authentication attempts
🔍 How to Verify
Check if Vulnerable:
Check Mendix SAML module version in Mendix Modeler or application configuration. Compare against affected versions.Check Version:
Check Mendix Modeler module dependencies or application configuration files for SAML module versionVerify Fix Applied:
Verify the SAML module version is updated to V4.0.3, V4.1.2, or V3.6.21 depending on Mendix compatibility. Test SSO authentication functionality.📡 Detection & Monitoring
Log Indicators:
- Failed SAML signature validations
- Unusual SSO authentication patterns
- Authentication attempts from unexpected sources
Network Indicators:
- Unusual traffic to SAML assertion consumer service endpoints
- SAML responses without proper signatures
SIEM Query:
Search for authentication events with SAML protocol anomalies or failed signature validations