---
id: CVE-2026-84003
title: >-
  Authentication bypass by capture-replay in Microsoft Authentication Library
  (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a
  network.
summary: >-
  Authentication bypass by capture-replay in Microsoft Authentication Library
  (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a
  network.
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-294
vendor: microsoft
product: azure/msal-node
affected:
  - azure/msal-node < 5.6.0
patched:
  - azure/msal-node 5.6.0
published: '2026-09-08'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T14:06:28.077'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84003'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84003'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00599
epssPercentile: 0.46401
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-11T20:49:07.570578Z'
ingestedAt: '2026-09-08T19:08:49.634Z'
---

## Overview

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

## Affected

- `azure/msal-node < 5.6.0`

## Remediation

Upgrade past the affected range:

- `azure/msal-node 5.6.0`