{"id":"CVE-2026-58638","aliases":["EUVD-2026-44315","GHSA-h2wp-qqpw-35j4"],"status":"published","title":"Windows Boot Loader Security Feature Bypass Vulnerability","description":"Missing cryptographic step in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.","severity":{"version":"3.1","score":6,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00235,"percentile":0.14519,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-325"],"published":"2026-07-14T17:10:16Z","modified":"2026-11-10T22:40:57Z","products":[{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows 10 version 21h2"},{"vendor":"microsoft","product":"windows 10 version 22h2"},{"vendor":"microsoft","product":"windows 11 version 24h2"},{"vendor":"microsoft","product":"windows 11 version 25h2"},{"vendor":"microsoft","product":"windows 11 version 26h1"},{"vendor":"microsoft","product":"windows server 2012"},{"vendor":"microsoft","product":"windows server 2012 (server core installation)"},{"vendor":"microsoft","product":"windows server 2012 r2"},{"vendor":"microsoft","product":"windows server 2012 r2 (server core installation)"},{"vendor":"microsoft","product":"windows server 2016"},{"vendor":"microsoft","product":"windows server 2016 (server core installation)"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"vendor":"microsoft","product":"windows_10_1809"},{"vendor":"microsoft","product":"windows_10_21h2"},{"vendor":"microsoft","product":"windows_10_22h2"},{"vendor":"microsoft","product":"windows_11_23h2"},{"vendor":"microsoft","product":"windows_11_24h2"},{"vendor":"microsoft","product":"windows_11_25h2"},{"vendor":"microsoft","product":"windows_11_26h1"},{"vendor":"microsoft","product":"windows_server_2012"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"},{"vendor":"microsoft","product":"windows_server_2022"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58638","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58638"},{"url":"https://github.com/advisories/GHSA-h2wp-qqpw-35j4"}],"sources":{"cve":[{"id":"CVE-2026-58638","title":"Windows Boot Loader Security Feature Bypass Vulnerability","description":"Missing cryptographic step in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.","status":"published","published":"2026-07-14T17:10:16.475Z","modified":"2026-11-10T22:40:57.469Z","cvss":[{"version":"3.1","score":6,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"cwes":["CWE-325"],"updated_at":"2026-11-10T23:49:29.755102Z"}],"euvd":[{"id":"EUVD-2026-44315","description":"Missing cryptographic step in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.","status":"published","published":"2026-07-14T17:10:16Z","modified":"2026-11-10T22:40:57Z","cvss":[{"version":"3.1","score":6,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-11T00:24:46.475072Z"}],"ghsa":[{"id":"GHSA-h2wp-qqpw-35j4","title":"Missing cryptographic step in Windows Boot Loader allows an authorized attacker to bypass a...","description":"Missing cryptographic step in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.","status":"published","published":"2026-07-14T18:32:42Z","modified":"2026-07-14T18:32:51Z","cvss":[{"version":"3.1","score":6,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"cwes":["CWE-325"],"updated_at":"2026-11-02T15:09:31.319926Z"}],"nvd":[{"id":"CVE-2026-58638","description":"Missing cryptographic step in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.","status":"published","published":"2026-07-14T18:18:46.137Z","modified":"2026-07-22T16:18:42.83Z","cvss":[{"version":"3.1","score":6,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-325"],"updated_at":"2026-11-02T14:12:29.879716Z"}]}}