Vulnerability in Microsoft Authentication Library

CVE-2026-84003

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

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-84003?
CVE-2026-84003 is a high-severity vulnerability in Microsoft Authentication Library, classified under Authentication Bypass by Capture-replay. CVSS score: 7.4/10. Published 2026-09-08.
How severe is CVE-2026-84003?
High severity. CVSS v3 base score is 7.4 out of 10.