Authentication Bypass by Capture-replay in Microsoft Authentication Library (MSAL) for Node.js - CVE-2026-84003
Published: September 9, 2026
Vulnerability identifier: #VU148065
CSH Severity: High
CVSS v4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-84003
CWE-ID: CWE-294
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js. A remote attacker can perform spoofing attack.
Affected software
Microsoft Authentication Library (MSAL) for Node.js
How to mitigate CVE-2026-84003
Install updates from vendor's website.
Microsoft Authentication Library (MSAL) for Node.js - update to 5.6.0