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Microsoft Security Response CenterCVE-2026-84003

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

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

Read the vendor bulletin Get alerts for Microsoft Authentication Library (MSAL) for Node.js
7.4CVSS out of 10High severity
Scope

What the vendor says is affected

  • Microsoft Authentication Library (MSAL) for Node.js

Versions the vendor lists as fixed

  • 5.6.0
Next step

What the vendor recommends

Release Notes

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  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.

Vulnerabilities

CVEs named in this advisory

CVE-2026-84003View CVSS, KEV, EPSS, and threat context
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