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Threat Actors & CampaignsEmerging1 sourceAug 19, 2026 · 10:09via CyberInsider

Bad Microsoft Defender update causes Windows crashes on scans

Brief

Microsoft Defender users are reporting widespread scan failures after a recent security intelligence update, with Quick and Full scans crashing the antivirus engine and Offline scans reportedly freezing near completion. Reports from system administrators, home users, and Microsoft’s support forum indicate the issue is tied to recent Defender updates rather than malware compromising affected PCs. …

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