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New Windows Defender zero-day blocks Microsoft antivirus updates

BleepingComputerBy Sergiu Gatlan

PoC publicWindows Defender

Our summary

Researcher Abdelhamid Naceri released BigDiskBuster, a proof of concept that can prevent Windows Defender from receiving platform and signature updates on supported Windows versions while it runs in the background. The update-blocking issue has no CVE ID or vendor patch yet; it follows other Defender flaws, including ShieldBreak, tracked as CVE-2026-69414.

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  1. The Hacker News⚡ Weekly Recap: Rogue AI Agents, WeChat Worm, PaperCut Attacks, AI Espionage, and RootkitsCVE-2026-69414
  2. Dark ReadingNightmare-Eclipse Strikes Again with 'ShieldCrash' Windows ExploitCVE-2026-69414
  3. Хакер (xakep.ru)Появился новый 0-day-эксплоит ShieldCrash для повышения привилегий через Microsoft DefenderCVE-2026-69414
  4. SecurityWeekNew ‘ShieldCrash’ Zero-Day Exploit Targets Microsoft DefenderCVE-2026-69414
  5. Help Net SecuritySeptember 2026 Patch Tuesday: Record patch count, 2 zero-days, and a SigRed successorCVE-2026-69414
  6. The Hacker NewsResearcher Drops New Microsoft Defender PoC Showing ShieldBreak Patch Can Be BypassedCVE-2026-69414
  7. Help Net SecuritySeptember 2026 Patch Tuesday forecast: All we need is more timeCVE-2026-69414
  8. The Hacker NewsResearcher Releases FalconFlank PoC Showing Privilege Escalation in CrowdStrike FalconCVE-2026-69414
  9. Qualys Security BlogCVE-2026-69414 ShieldBreak Zero-Day: No Patch, and CISA BOD 26-04 Gives You 14 DaysCVE-2026-69414
  10. SecurityWeekMicrosoft Rolls Out 22 Fresh Security PatchesCVE-2026-69414

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