Cyber•2 reports
35DOOM SCORE
Microsoft Defender update causes crashes and exposes a confirmed flaw
First seen: Aug 18, 2026, 9:46 PM UTCUpdated: Aug 19, 2026, 6:46 PM UTC
WHAT HAPPENED
A bad Microsoft Defender update is reportedly causing crashes and breaking scans on PCs. Microsoft has also confirmed a Defender flaw known as ShieldBreak.
SO WHAT?
The issue could disrupt security scanning and affect the protection of users relying on Microsoft Defender.
FOR ME
Impact on Switzerland
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MARKETS
Market impact
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COVERAGE