EUVD-2026-73638
GHSA-6h96-gj9r-5r97
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack vector with low-privileged account required; AC:L consistent with reliable double-free trigger; full C/I/A reflects SYSTEM-level privilege escalation outcome.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Double free in Windows Hello allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Hello across multiple Windows 10 and 11 versions allows an authorized low-privileged local attacker to gain full system control via a double-free memory corruption vulnerability (CWE-415). Affected builds span Windows 10 21H2/22H2 through Windows 11 26H1. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authorized local account with at least low-privileged interactive or programmatic access to the target system - the CVSS PR:L metric confirms a standard user account suffices and no administrative rights are needed prior to exploitation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects a realistic local privilege escalation: requires a low-privileged local account, no user interaction, and yields full C/I/A compromise. … 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 Microsoft's security update to reach the following fixed builds: 10.0.19044.7725 (Windows 10 21H2), 10.0.19045.7725 (Windows 10 22H2), 10.0.22631.7582 (Windows 11 23H2), 10.0.26100.9445 (Windows 11 24H2), 10.0.26200.9445 (Windows 11 25H2), and 10.0.28000.2954 (Windows 11 26H1). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 and 11 devices and identify which are running affected versions (Windows 10: 21H2/22H2; Windows 11: up to 26H1). …
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Same weakness CWE-415 – Double Free
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External POC / Exploit Code
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