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CVE-2026-41091 RedSun | Microsoft Defender LPE exploit. Low-privileged users gain NT AUTHORITY\SYSTEM - via Cloud Files API + NTFS junction trickery. Forces Defender to write malicious payloads to System32 with SYSTEM rights - Actively exploited in wild. CVSS 7.8. Patch: Defender Engine 1.1.26040.8. Educational & Legal uses only.