{"id":61354,"date":"2026-09-09T17:23:00","date_gmt":"2026-09-09T17:23:00","guid":{"rendered":"https:\/\/www.theregister.com\/a\/5295335"},"modified":"2026-09-09T17:23:00","modified_gmt":"2026-09-09T17:23:00","slug":"serial-microsoft-0-day-hunter-drops-yet-another-defender-exploit","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/serial-microsoft-0-day-hunter-drops-yet-another-defender-exploit\/","title":{"rendered":"Serial Microsoft 0-day hunter drops yet another Defender exploit"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/image.theregister.com\/4094178.jpg?imageId=4094178&amp;x=0&amp;y=0&amp;cropw=100&amp;croph=100&amp;panox=0&amp;panoy=0&amp;panow=100&amp;panoh=100&amp;width=1200&amp;height=683\" class=\"ff-og-image-inserted\"><\/div>\n<div data-element-guid=\"d11159dd-82a3-4c53-901c-d41dec75505c\" readability=\"30.777202072539\">\n<p class=\"kicker \">security<\/p>\n<p class=\"subtitle \">A bypass of a bypass of a bypass<\/p>\n<\/p><\/div>\n<div data-element-guid=\"4c9dc5d9-c886-4348-bf4a-01d0dc71377d\" readability=\"71.153981059277\"> <!-- placeholder(#1) --> <\/p>\n<p>Zero-day researcher Nightmare Eclipse, aka MSNightmare, published yet another Microsoft Defender proof-of-concept exploit for a zero-day dubbed ShieldCrash, which they claim will&nbsp;allow attackers to bypass the earlier ShieldBreak patch and read files as SYSTEM.<\/p>\n<p>\u201cI might rework this later into a full SYSTEM PoC but for now I&#8217;m dropping this skeleton PoC because I&#8217;m feeling a bit lazy,\u201d the prolific Microsoft bug hunter and thorn in Redmond&#8217;s side&nbsp;<a href=\"https:\/\/github.com\/MSNightmare\/ShieldCrash\/blob\/main\/README.md\" rel=\"nofollow\">said<\/a>&nbsp;in their latest zero-day exploit&#8217;s README.<\/p>\n<p>As is usual with Nightmare\u2019s zero-day cadence, they published ShieldCrash shortly after Microsoft released its latest <a href=\"https:\/\/www.theregister.com\/security\/2026\/09\/09\/microsoft-breaks-patch-tuesday-record-with-974-cve-deluge\/5295160\">Patch Tuesday security updates<\/a>. According to Nightmare, this exploit works on Windows systems that have already applied the September patches.<\/p>\n<p>ShieldCrash purports to be a bypass of an earlier Defender privilege escalation zero-day, <a href=\"https:\/\/www.theregister.com\/cyber-crime\/2026\/08\/12\/microsoft-vendetta-hacker-has-a-new-zero-day-that-gives-system-privileges-on-fully-patched-windows\/5286889\">ShieldBreak<\/a> (<a href=\"https:\/\/msrc.microsoft.com\/update-guide\/en-US\/advisory\/CVE-2026-69414\" rel=\"nofollow\">CVE-2026-69414<\/a>), that allowed attackers to bypass another patch for another Nightmare Eclipse zero-day <a href=\"https:\/\/www.theregister.com\/security\/2026\/07\/09\/microsoft-closes-book-on-nightmare-eclipses-rogueplanet-zero-day\/5269280\">RoguePlanet<\/a> (<a href=\"https:\/\/msrc.microsoft.com\/update-guide\/en-US\/advisory\/CVE-2026-50656\" rel=\"nofollow\">CVE-2026-50656<\/a>).<\/p>\n<p>Redmond patched ShieldBreak last week, and RoguePlanet in July. Both allowed attackers to gain SYSTEM privileges on fully patched Windows 10, Windows 11, and Windows Server systems.<\/p>\n<p>The latest bypass, ShieldCrash, allows arbitrary file reads as SYSTEM &#8211; but not arbitrary writes or a full SYSTEM shell, according to the researcher.<\/p>\n<p>Microsoft did not immediately respond to <span class=\"italic m-italic \" data-lab-italic=\"italic\">The Register<\/span>\u2019s questions, including when it planned to patch ShieldCrash. We will update this story when we hear back.<\/p>\n<p>While the serial bug hunter typically finds and <a href=\"https:\/\/www.theregister.com\/security\/2026\/07\/15\/microsofts-serial-tormentor-drops-legacyhive-0-day\/5271723\">publishes Microsoft exploits<\/a> &#8211; ShieldCrash is Nightmare\u2019s 11th Microsoft zero-day, and they have made clear that with Redmond, <a href=\"https:\/\/www.theregister.com\/security\/2026\/05\/28\/microsoft-0-day-feud-escalates-as-researcher-threatens-another-windows-exploit-dump\/5248085\">their vendetta is personal<\/a> &#8211; they recently branched out into other security vendors\u2019 software.<\/p>\n<p>Last week, they released a <a href=\"https:\/\/www.theregister.com\/security\/2026\/09\/03\/prolific-microsoft-0-day-hunter-drops-crowdstrike-falcon-exploit-poc\/5294318\">zero-day bug called FalconFlank<\/a> that affects CrowdStrike\u2019s Falcon endpoint security platform. This one still has a Windows twist: the privilege escalation bug abuses the Microsoft Office malicious macros remediation feature in CrowdStrike Falcon.&nbsp;<\/p>\n<p>Security sleuth Kevin Beaumont <a href=\"https:\/\/infosec.exchange\/@GossiTheDog@cyberplace.social\/117207576682511216\" rel=\"nofollow\">confirmed<\/a> the FalconFlank exploit works, along with several others Nightmare released over the past couple of weeks. These include HardBreacher, a now-patched elevation of privileges bug in Kaspersky\u2019s endpoint antivirus product, and PrettyPrague, an elevation of privileges vuln in Gen Digital\u2019s Avast antivirus software.&nbsp;\u00ae<\/p>\n<\/p><\/div>\n<p><img decoding=\"async\" src=\"https:\/\/image.theregister.com\/?imageId=4094178&#038;width=800\">READ MORE <a href=\"https:\/\/www.theregister.com\/security\/2026\/09\/09\/serial-microsoft-0-day-hunter-drops-yet-another-defender-exploit\/5295335\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p> A bypass of a bypass of a bypass READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[307],"class_list":["post-61354","post","type-post","status-publish","format-standard","hentry","category-the-register","tag-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Serial Microsoft 0-day hunter drops yet another Defender exploit 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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