EUVD-2026-73115
GHSA-xx88-v4cq-w4wj
Severity by source
AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Local-only exploitation requiring administrator privileges (PR:H) with scope change escaping Credential Guard VBS boundary; all impacts high once boundary is crossed.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Double free in Windows Credential Guard allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation through a double-free memory corruption flaw in Windows Credential Guard affects Windows 11 (versions 24H2, 25H2, 26H1) and Windows Server 2025. An attacker who already holds elevated local privileges on a target system can exploit the CWE-415 defect to escape the Credential Guard security boundary, achieving scope change with high confidentiality, integrity, and availability impact on protected credential stores. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the attacker already holds high-privileged (administrator or equivalent) local access to the target Windows system - the CVSS PR:H metric confirms this. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.2 score is driven by the scope change and high impact across all three pillars (C:H/I:H/A:H), which is appropriate given that Credential Guard isolation is the target. … 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 immediately: Windows 11 24H2 and Server 2025 should be upgraded to build 10.0.26100.33438 or later; Windows 11 25H2 to 10.0.26200.9445 or later; Windows 11 26H1 to 10.0.28000.2954 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows 11 systems running versions 24H2, 25H2, or 26H1, and Windows Server 2025 instances to establish scope of exposure. …
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Same weakness CWE-415 – Double Free
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External POC / Exploit Code
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