CVE tracker / CVE-2026-27928

CVE-2026-27928

CVE-2026-27928 is the Windows Hello Security Feature Bypass Vulnerability. Microsoft rates it Important, CVSS 8.7. It is not in CISA's Known Exploited Vulnerabilities catalog. Published April 14, 2026.

Risk summary

HighSecurity Feature Bypass
8.7
CVSS v3 base
0.4%
EPSS: chance of exploitation in 30 days
High
Severity
Important
Microsoft's rating
Less Likely
Microsoft: exploitation
No
In CISA KEV

Microsoft describes it: “Improper input validation in Windows Hello allows an unauthorized attacker to bypass a security feature over a network.”

How to fix it

Microsoft lists 9 affected products and the update that fixes each:

What Microsoft changed

Details

Weakness
CWE-20: Improper Input Validation
Publicly disclosed (Microsoft)
No
Exploited (Microsoft)
No
Known exploited (CISA KEV)
Not listed
Published
April 14, 2026
Last revised
April 14, 2026

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References

Microsoft Security Update Guide NVD CVE record CWE

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.