EUVD-2026-73639
GHSA-r5gv-wc2x-fh3c
Severity by source
AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Local access and low privilege confirmed by description; AC:H reflects UAF heap-grooming complexity; S:C and full C/I/A reflect post-escalation cross-boundary impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Use after free in Windows Hello allows an authorized attacker to elevate privileges locally.
AnalysisAI
Use-after-free memory corruption in the Windows Hello authentication subsystem allows a local, low-privileged authenticated user to escalate privileges to a higher-integrity context across a security boundary. Affected builds span Windows 10 21H2/22H2 and Windows 11 23H2 through 26H1, with specific patched build numbers published by Microsoft. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local user account on an affected Windows 10 or Windows 11 build - the CVSS PR:L metric confirms a low-privilege (non-administrator) user is sufficient. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score reflects local access (AV:L), high attack complexity (AC:H), and low-privilege requirement (PR:L), which together reduce the population of immediately exploitable targets compared with a network-facing flaw. … 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 Microsoft-released patches via Windows Update or WSUS, targeting the fixed build numbers: Windows 10 21H2 → 10.0.19044.7725 or later; Windows 10 22H2 → 10.0.19045.7725 or later; Windows 11 23H2 → 10.0.22631.7582 or later; Windows 11 24H2 → 10.0.26100.9445 or later; Windows 11 25H2 → 10.0.26200.9445 or later; Windows 11 26H1 → 10.0.28000.2954 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, use your endpoint management or patch management system to enumerate all Windows 10 (builds 21H2 and 22H2) and Windows 11 (builds 23H2 through 26H1) systems in your environment. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
Leaving vuln.today