Summary
Impact: Security Feature Bypass. Microsoft rating: Important. Not known to be exploited — Exploitation More Likely. Customer action: Required.
Details
What kind of security feature could be bypassed by successfully exploiting this vulnerability?
This vulnerability could allow an attacker with administrative control of the operating system to bypass protection mechanisms that rely on trusted, non‑rollback TPM counters. Specifically, it could undermine Windows Hello’s safeguards that prevent reuse of pre‑generated authentication keys and Recall’s protections against loading older, potentially tampered‑with settings.
Security updates
10.0.19044.7184 — https://support.microsoft.com/help/5082200
10.0.26200.8246 — https://support.microsoft.com/help/5083769
10.0.22631.6936 — https://support.microsoft.com/help/5082052
10.0.28000.1836 — https://support.microsoft.com/help/5083768
Vulnerabilities 1
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Medium 4.4
Windows Hello Security Feature Bypass Vulnerability
Improper input validation in Windows Hello allows an authorized attacker to bypass a security feature locally.
Revision history
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#1
Information published.
References
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CVE-2026-27906 Windows Hello Security Feature Bypass Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27906
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss