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Microsoft Security Response CenterCVE-2026-84003

Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability

HighVendor CVSS 7.4 / 10 1 CVE Published Sep 8, 2026 at 7:00 AM UTC

Summary

Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.

Products covered

  • Microsoft Authentication Library (MSAL) for Node.js

Remediation

Release Notes

Vendor-listed fixes

  • 5.6.0

CVEs in this advisory 1

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.