CISA has issued an urgent alert warning organizations about two newly disclosed zero-day vulnerabilities affecting Microsoft Defender, both added to the Known Exploited Vulnerabilities (KEV) catalog on May 20, 2026. CVE-2026-45498: Microsoft Defender DoS Vulnerability CVE-2026-45498 is a denial-of-service (DoS) vulnerability in Microsoft Defender that can cause the security service to stop functioning. An attacker […]
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