Microsoft Account Spoofing Vulnerability
Priority MEDIUM 42CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from Microsoft.
Summary
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Account allows an unauthorized attacker to perform spoofing over a network.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00413 35th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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
No fixed version listed by the sources yet.
Vendor assessments
Microsoft
Microsoft's page for this CVE →
- Impact
- Spoofing
- Exploited
- No
- Publicly disclosed
- No
- Exploitability
- —
Timeline
- 2026-10-02 Threatist record created from CVE-2026-21264
- 2026-10-03 Alias added: GHSA-3h7x-hf52-fwj9
References
More Microsoft Account vulnerabilities
- TI-2026-40540 Microsoft Account Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
- TI-2025-15362 Microsoft Account Elevation of Privilege Vulnerability CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-21264 · CVE Program
- CVE-2026-21264 · NVD
- FIRST EPSS
- GHSA-3h7x-hf52-fwj9 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-21264 · Microsoft Security Update Guide
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences