{"id":"CVE-2026-20876","title":"Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.","summary":"Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.","severity":"medium","cvss":6.7,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-122"],"vendor":"microsoft","product":"windows_11_23h2","affected":["windows_11_23h2 < 10.0.22631.6491","windows_11_24h2 < 10.0.26100.7623","windows_11_25h2 < 10.0.26200.7623","windows_server_2022_23h2 < 10.0.25398.2092","windows_server_2025 < 10.0.26100.32230"],"patched":["windows_11_23h2 10.0.22631.6491","windows_11_24h2 10.0.26100.7623","windows_11_25h2 10.0.26200.7623","windows_server_2022_23h2 10.0.25398.2092","windows_server_2025 10.0.26100.32230"],"published":"2026-01-13","updated":"2026-07-30","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-20876","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20876","label":"secure@microsoft.com"}],"tags":["nvd"],"epss":0.00516,"epssPercentile":0.42904,"ingestedAt":"2026-07-31T06:58:52.976Z","slug":"CVE-2026-20876","body":"## Overview\n\nHeap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.\n\n## Affected\n\n- `windows_11_23h2 < 10.0.22631.6491`\n- `windows_11_24h2 < 10.0.26100.7623`\n- `windows_11_25h2 < 10.0.26200.7623`\n- `windows_server_2022_23h2 < 10.0.25398.2092`\n- `windows_server_2025 < 10.0.26100.32230`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_11_23h2 10.0.22631.6491`\n- `windows_11_24h2 10.0.26100.7623`\n- `windows_11_25h2 10.0.26200.7623`\n- `windows_server_2022_23h2 10.0.25398.2092`\n- `windows_server_2025 10.0.26100.32230`","depth":"sunlit","depthScore":37,"depthScoreParts":{"impact":36.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}