EUVD-2026-56378
GHSA-h4wc-gf43-2r9g
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low-privilege confirmed by description; high complexity reflects UAF heap-state dependency; full C/I/A reflects SYSTEM-level privilege escalation consequence.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Kerberos allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Kerberos via a use-after-free memory corruption flaw allows a locally authenticated attacker to gain SYSTEM-level access on affected Windows systems. The vulnerability spans nearly all current Microsoft Windows client and server releases, from Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an existing authenticated local session with at least standard (low-privileged) user credentials on the target Windows system, consistent with CVSS PR:L and AV:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.0 reflects a meaningful but constrained threat profile. … 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 security update for CVE-2026-62773 via Windows Update, WSUS, or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an inventory of all affected Windows systems (Server 2012-2025 and Windows 11 26H1 and earlier). …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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