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ShieldBreak bypasses Microsoft’s patch for earlier Defender flaw
Microsoft Defender’s latest patch bypass shows a familiar problem. A newly disclosed Microsoft Defender flaw called ShieldBreak shows that fixing one attack path doesn’t always close every route to the same result. Microsoft has assigned ShieldBreak the identifier CVE-2026-69414 and confirmed it is an elevation of privilege (EoP) vulnerability in the Microsoft Malware Protection Engine. Microsoft says it is still working on a security update. If that sounds somehow familiar, you’re probably thinking of RoguePlanet , another vulnerability in Defender that Microsoft acknowledged on June 16 and patched on July 8. A short timeline At the time, the published exploit for RoguePlanet was described as depending on a race condition, meaning it was not guaranteed to work the same way on every machine.
Microsoft working on Defender patch for ShieldBreak zero-day
Microsoft is working on a security patch for the "ShieldBreak" zero-day vulnerability disclosed last week by security researcher "Nightmare Eclipse" and now tracked as CVE-2026-69414. [... ]
CVE-2026-69414 Microsoft Defender Elevation of Privilege Vulnerability
Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender publicly referred to as "ShieldBreak ". We are working to provide a high quality security update that addresses this vulnerability. We will provide information in this CVE when the update is available.
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