CVE-2026-84003Important
Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability
Assessment
Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.
- Severity
- Important
- CVSS base score
- 7.4CVSS:3.1/
AV:N/ AC:H/ PR:N/ UI:N/ S:U/ C:H/ I:H/ A:N/ E:U/ RL:O/ RC:C - Impact
- Spoofing
- EPSS, next 30 days
- 0.6%Higher than 46.5% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
- Exploitability
- Exploitation Less Likely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Microsoft Authentication Library (MSAL) for Node.js
- Weakness
- CWE-294: Authentication Bypass by Capture-replay
- Issued by
- Microsoft
- Published
- 8 Sep 2026 · September 2026
- Last revised
- 8 Sep 2026
Updates that fix it
0 KBsNo KB listed
MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.
Affected products
Azure1 affected product
- Microsoft Authentication Library (MSAL) for Node.js