CVE-2026-84003
Microsoft Authentication Library (MSAL) for Node.js Spoofing vulnerability
MSRC advisory September 8, 2026
Alert details
- Source feed
- Microsoft MSRC
- CVE ID
- CVE-2026-84003
- Affected products
- Microsoft Authentication Library (MSAL) for Node.js Spoofing · Microsoft Microsoft Authentication Library (MSAL) for Node.js Spoofing · Microsoft
What happened
<p>Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.</p>
What it means for your business
Microsoft Authentication Library (MSAL) for Node.js Spoofing vulnerability (CVE-2026-84003) was added to Microsoft’s security update guidance. <p>Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.</p> If you need help checking exposure, call (864) 335-9223.
EPSS probability
0.60%
Sources
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