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Microsoft Security Response Center

Source: https://msrc.microsoft.com/update-guide/

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    MSRC-CVE-2026-45498 1 CVE 1 exploited rev. 2

    Microsoft Defender Denial of Service Vulnerability

    Impact: Denial of Service. Microsoft rating: Low. Exploited according to Microsoft, publicly disclosed before the fix — Exploitation Detected. Customer action: Required.

    Microsoft
    first May 19, 2026