CVE-2026-84003
Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability
CVSS Score
7.4
EPSS Score
0.4%
EPSS Percentile
37th
Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.
| Vendor | microsoft |
| Product | microsoft authentication library |
| Ecosystems | |
| Industries | TechnologyEnterprise |
| Published | Sep 8, 2026 |
| Last Updated | Sep 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Microsoft / Microsoft Authentication Library
1.0.0 < 5.6.0