{"id":"CVE-2026-0390","title":"UEFI Secure Boot Security Feature Bypass Vulnerability","summary":"Reliance on untrusted inputs in a security decision in Windows Boot Loader allows an authorized attacker to bypass a security feature 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/E:U/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-807"],"vendor":"Microsoft","product":"Windows 10 Version 1607","affected":["windows_10_version_1607 >= 10.0.14393.0 < 10.0.14393.9060","windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.8644","windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7184","windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19045.7184","windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9060","windows_server_2016_server_core_installation >= 10.0.14393.0 < 10.0.14393.9060","windows_server_2019 >= 10.0.17763.0 < 10.0.17763.8644","windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.8644","windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5020"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-04-15T03:57:24.351150Z"},"published":"2026-04-14","updated":"2026-09-25","sourceUpdated":"2026-09-25T17:25:18.702Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-0390","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-0390","label":"UEFI Secure Boot Security Feature Bypass Vulnerability"}],"tags":["cve.org"],"epss":0.00318,"epssPercentile":0.22039,"ingestedAt":"2026-09-25T18:14:20.448Z","slug":"CVE-2026-0390","body":"## Overview\n\nReliance on untrusted inputs in a security decision in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.\n\n## Affected\n\n- `windows_10_version_1607 >= 10.0.14393.0 < 10.0.14393.9060`\n- `windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.8644`\n- `windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7184`\n- `windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19045.7184`\n- `windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9060`\n- `windows_server_2016_server_core_installation >= 10.0.14393.0 < 10.0.14393.9060`\n- `windows_server_2019 >= 10.0.17763.0 < 10.0.17763.8644`\n- `windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.8644`\n- `windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5020`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":37,"depthScoreParts":{"impact":36.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}