EUVD-2026-73767
GHSA-h5q8-865p-x27f
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access and low privileges required; AC:H reflects race-condition timing window; full C/I/A impact reflects SYSTEM-level privilege escalation outcome.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Use after free in Windows Authentication Methods allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Authentication Methods affects all supported Windows 10, Windows 11, and Windows Server releases through a use-after-free condition triggered via a race condition (CWE-362). An attacker with low-privileged local access can win a timing window in the authentication subsystem, corrupt freed memory, and elevate to full SYSTEM-level privileges with complete confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authorized (low-privilege) account with local logon capability on the target Windows system - matching the CVSS PR:L/AV:L metrics. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H yields a base score of 7.0, reflecting that exploitation requires local access, low-privilege credentials, and a high-complexity race-condition timing window - all of which meaningfully constrain real-world risk. … 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 patches distributed via Windows Update or WSUS targeting the fixed build numbers listed per OS version above. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a comprehensive inventory of Windows 10, Windows 11, and Windows Server 2016-2025 systems and evaluate how many permit local user access (including non-administrative accounts). …
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
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External POC / Exploit Code
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