{"id":243844,"date":"2026-09-10T01:17:43","date_gmt":"2026-09-10T06:17:43","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2026\/09\/new-microsoft-defender-shieldcrash-zero-day-grants-system-access"},"modified":"2026-09-10T01:17:43","modified_gmt":"2026-09-10T06:17:43","slug":"new-microsoft-defender-shieldcrash-zero-day-grants-system-access","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2026\/09\/new-microsoft-defender-shieldcrash-zero-day-grants-system-access","title":{"rendered":"New Microsoft Defender \u2018ShieldCrash\u2019 zero-day grants SYSTEM access"},"content":{"rendered":"<p><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/new-microsoft-defender-shieldcrash-zero-day-grants-system-access.jpg\"><\/a><\/p>\n<p>An anonymous security researcher known as Nightmare Eclipse has released a new Microsoft Defender zero-day exploit named \u201c<a href=\"https:\/\/twitter.com\/msnightmare2000\/status\/2097402129723932719\" rel=\"nofollow noopener\" target=\"_blank\">ShieldCrash<\/a>\u201d right after Microsoft rolled out its September 2026 Patch Tuesday security updates.<\/p>\n<p>ShieldCrash is described as a bypass for the <a href=\"https:\/\/www.bleepingcomputer.com\/news\/security\/new-microsoft-defender-shieldbreak-zero-day-grants-system-privileges\/\" target=\"_blank\" rel=\"nofollow noopener\">ShieldBreak<\/a> Defender privilege escalation flaw <a href=\"https:\/\/msrc.microsoft.com\/update-guide\/en-US\/advisory\/CVE-2026-69414\" target=\"_blank\" rel=\"nofollow noopener\">patched on Thursday<\/a>, which itself bypassed <a href=\"https:\/\/www.bleepingcomputer.com\/tag\/rogueplanet\/\" target=\"_blank\" rel=\"nofollow noopener\">RoguePlanet<\/a>, another Defender flaw disclosed in June and patched by Microsoft in July.<\/p>\n<p>According to Nightmare Eclipse, the <a href=\"https:\/\/github.com\/MSNightmare\/ShieldCrash\" target=\"_blank\" rel=\"nofollow noopener\">ShieldCrash proof-of-concept exploit<\/a> lets attackers gain SYSTEM privileges on fully patched Windows 10, Windows 11, and Windows Server systems, but will not give them write access to the compromised systems.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>An anonymous security researcher known as Nightmare Eclipse has released a new Microsoft Defender zero-day exploit named \u201cShieldCrash\u201d right after Microsoft rolled out its September 2026 Patch Tuesday security updates. ShieldCrash is described as a bypass for the ShieldBreak Defender privilege escalation flaw patched on Thursday, which itself bypassed RoguePlanet, another Defender flaw disclosed in [\u2026]<\/p>\n","protected":false},"author":427,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1492],"tags":[],"class_list":["post-243844","post","type-post","status-publish","format-standard","hentry","category-security"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/243844","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/427"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=243844"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/243844\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=243844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=243844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=243844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}