CVE-2026-84003

High

Description

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

SeverityHigh

CVSS7.4

Exploit probability—

Product

Microsoft Azure\/msal-node

PublishedSep 8, 2026

First seenSep 8, 2026

Weakness typeCWE-294CWE-294

How to fix

Update

microsoft azure\/msal-node5.6.0 or later

Patches

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84003

Affected products

Product	Affected versions	Fixed in
microsoft azure\/msal-node	v < 5.6.0	5.6.0

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