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CVE-2026-84003— Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability

Quick assessment

Affected
Microsoft Microsoft Authentication Library
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Authentication Library是美国Microsoft公司开源的是一个身份验证库。 Microsoft Authentication Library 存在授权问题漏洞，该漏洞源于基于捕获重放的身份验证绕过，可能允许未经授权的攻击者通过网络实施欺骗攻击。

CVSS 7.4 · High EPSS 0.60% · P49

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft Authentication Library 1.0.0< 5.6.0 affected
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I. Basic Information for CVE-2026-84003

Vulnerability Information
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Vulnerability Title
Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Authentication Library 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Authentication Library是美国Microsoft公司开源的是一个身份验证库。 Microsoft Authentication Library 存在授权问题漏洞，该漏洞源于基于捕获重放的身份验证绕过，可能允许未经授权的攻击者通过网络实施欺骗攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft Authentication Library 1.0.0 ~ 5.6.0 -

II. Public POCs for CVE-2026-84003

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III. Intelligence Information for CVE-2026-84003

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Vendor Advisories for CVE-2026-84003 (1)

Same Patch Batch · Microsoft · 2026-09-08 · 966 CVEs total

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Showing top 20 of 966 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same vendor: Microsoft
Same weakness: CWE-294