Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability
Priority LOW 35CWE-294Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from Microsoft.
Summary
Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00599 48th percentileScored 2026-11-07
Fix Fixed Microsoft Authentication Library (Microsoft): 5.6.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA Microsoft Authentication Library (Microsoft) Fixed in 5.6.0
Vendor assessments
Microsoft
Microsoft's page for this CVE →
- Impact
- Spoofing
- Exploited
- No
- Publicly disclosed
- No
- Exploitability
- Exploitation Less Likely
| Product | Status | Plan or fix |
|---|---|---|
| Microsoft Authentication Library (MSAL) for Node.js | Fixed | 5.6.0 · Security Update |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-84003
- 2026-10-03 Alias added: GHSA-gmqm-6r28-m87v
Sources
- CVE-2026-84003 · CVE Program
- CVE-2026-84003 · NVD
- FIRST EPSS
- GHSA-gmqm-6r28-m87v · GitHub Advisory Database · CC BY 4.0
- CVE-2026-84003 · Microsoft Security Update Guide
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences