Sep 2026: Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability
CVE-2026-84003 Published on September 8, 2026
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.
Weakness Type
Authentication Bypass by Capture-replay
A capture-replay flaw exists when the design of the software makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). Capture-replay attacks are common and can be difficult to defeat without cryptography. They are a subset of network injection attacks that rely on observing previously-sent valid commands, then changing them slightly if necessary and resending the same commands to the server.
Products Associated with CVE-2026-84003
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Affected Versions
Microsoft Authentication Library:- Version 1.0.0 and below 5.6.0 is affected.