Windows 11 23h2
CVE-2026-20876
MEDIUM
Severity by source
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Primary rating from Vendor (microsoft) · only source for this CVE.
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Virtualization-Based Security (VBS) Enclave affects Windows 11 and Windows Server 2022 through a heap-based buffer overflow in memory management. An authenticated local attacker with high privileges can exploit this vulnerability to gain unauthorized system-level access. No patch is currently available for this medium-severity vulnerability (CVSS 6.7).
Technical ContextAI
Classified as CWE-122 (Heap-based Buffer Overflow). Affects Windows 11 23H2. Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.
RemediationAI
Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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