EUVD-2026-73850
GHSA-7mj2-xr47-8q24
Severity by source
AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Local access, already-privileged attacker, no interaction needed, scope change indicates boundary crossing to higher integrity level.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Hello allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow (CWE-122) in Windows Hello affects Windows 10, Windows 11, and Windows Server 2019 across numerous build versions, allowing an authorized local attacker with high privileges to cross a security boundary and achieve full system compromise. The CVSS scope-change indicator (S:C) combined with C:H/I:H/A:H signals the overflow can propagate impact beyond the vulnerable Windows Hello component into other security principals - consistent with an admin-to-SYSTEM or authentication-subsystem boundary crossing. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authorized local attacker already operating with high-privilege credentials (PR:H) on the target Windows system - this is not a remote or unauthenticated attack path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 8.2 is driven primarily by the scope change and the full C:H/I:H/A:H triad rather than ease of initial access - PR:H already constrains who can trigger this, meaning the attacker must hold high-privilege credentials or compromise a privileged account before exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released Windows security update that brings each affected version to or above its patched build number: Windows 10 1809 to 10.0.17763.9245, Windows 10 21H2 to 10.0.19044.7725, Windows 10 22H2 to 10.0.19045.7725, Windows 11 23H2 to 10.0.22631.7582, Windows 11 24H2 to 10.0.26100.9445, Windows 11 25H2 to 10.0.26200.9445, Windows 11 26H1 to 10.0.28000.2954, and Windows Server 2019 to 10.0.17763.9245 - all available via Windows Update or WSUS per the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81354. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10, Windows 11, and Windows Server 2019 systems in your environment, with priority flagging for business-critical and external-facing systems. …
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External POC / Exploit Code
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