CVE-2025-54419
📋 TL;DR
CVE-2025-54419 is a critical authentication bypass vulnerability in Node-SAML library versions 5.0.1 and earlier. It allows attackers to modify authentication details within valid SAML assertions by exploiting a signature verification flaw. Any Node.js application using vulnerable Node-SAML versions for SAML authentication is affected.
💻 Affected Systems
- node-saml
⚠️ 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 authentication bypass allowing attackers to impersonate any user, gain unauthorized access to protected systems, and potentially escalate privileges.
Likely Case
Authentication manipulation allowing attackers to modify usernames or other attributes in SAML assertions, leading to unauthorized access to applications.
If Mitigated
Limited impact if proper network segmentation, multi-factor authentication, and monitoring are in place to detect anomalous authentication attempts.
🎯 Exploit Status
Exploitation requires a valid signed SAML document from the IdP. Attackers need to understand SAML protocol and have access to signed assertions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.1.0
Vendor Advisory: https://github.com/node-saml/node-saml/security/advisories/GHSA-4mxg-3p6v-xgq3
Restart Required: Yes
Instructions:
1. Update Node-SAML to version 5.1.0 or later using npm update node-saml. 2. Restart your Node.js application. 3. Verify the fix by testing SAML authentication flows.
🔧 Temporary Workarounds
Input validation enhancement
allImplement additional validation of SAML assertion content beyond signature verification
🧯 If You Can't Patch
- Implement additional authentication checks such as multi-factor authentication
- Monitor SAML authentication logs for unusual patterns or username modifications
🔍 How to Verify
Check if Vulnerable:
Check package.json or node_modules/node-saml/package.json for version 5.0.1 or earlierCheck Version:
npm list node-samlVerify Fix Applied:
Verify node-saml version is 5.1.0 or later and test SAML authentication with modified assertions📡 Detection & Monitoring
Log Indicators:
- Unusual username modifications in authentication logs
- Failed signature verification attempts
- SAML assertion parsing errors
Network Indicators:
- Modified SAML assertions in authentication requests
- Unexpected authentication source IPs
SIEM Query:
source="saml_auth" AND (event_type="authentication" AND username CONTAINS "-" OR username LENGTH changed)