Microsoft patched GreenPlasma and MiniPlasma, two zero-days granting SYSTEM privileges on fully patched Windows systems, and YellowKey, a backdoor bypassing BitLocker protection on unpatched Windows 11 and Server 2022/2025 systems. The flaws were disclosed by researcher Nightmare Eclipse in protest of Microsoft's disclosure process.
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Summary by ByteBrief
Microsoft Patches Exploited Exchange Server Vulnerability