VulnerabilityALERT High

CVE-2026-45498: Microsoft Defender Denial of Service Vulnerability

Microsoft Defender contains an unspecified vulnerability that allows for denial of service.

Impact

CISA lists CVE-2026-45498 as known exploited in the wild for Microsoft Defender. Ransomware campaign use: Unknown. Federal remediation due date: 2026-06-03.

Recommended Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Published: 5/20/2026, 12:00:00 AMSource: CISA Known Exploited Vulnerabilities CatalogTags: CVE-2026-45498, Microsoft, Defender, CISA KEV