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#8 BleepingComputer general August 12, 2026 at 10:15 UTC

New Microsoft Defender 'ShieldBreak' zero-day grants SYSTEM privileges

By Sergiu Gatlan

AI Summary

The Microsoft Defender zero-day exploit 'ShieldBreak,' released by Nightmare Eclipse immediately after the August 2026 Patch Tuesday, bypasses the patch for CVE-2026-50656 and enables privilege escalation to SYSTEM from any user context on Windows systems. The exploit, also linked to the 'LegacyHive' Windows zero-day patched in the same cycle, underscores the threat actor's pattern of timing disclosures to maximize exposure windows. Defenders should deploy August 2026 Patch Tuesday updates and monitor for privilege escalation activity via Defender.

Read full article → https://www.bleepingcomputer.com/news/security/new…

Relevance score: 83.0/100

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