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Luu, T.J.

🔥 This vulnerability is being actively exploited in the wild (CISA Known Exploited Vulnerabilities catalog)

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

infovulnerability🔥 Actively Exploited

security

Source: CISA Known Exploited VulnerabilitiesMay 19, 2026CVE-2026-45498

Summary

Microsoft Defender has a vulnerability that allows attackers to cause a denial of service (a type of attack where a service becomes unavailable to users). This vulnerability is currently being actively exploited by attackers, making it a priority security concern.

Solution / Mitigation

Apply mitigations per Microsoft vendor instructions, follow applicable BOD 22-01 guidance for cloud services (security requirements for government cloud systems), or discontinue use of the product if mitigations are unavailable.

Vulnerability Details

EPSS (30-day exploit probability)

EPSS: 0.0%

Patch Available

Yes

Exploit Maturity

🔥 Actively Exploited

Disclosure Date

May 19, 2026

Classification

Attack SophisticationModerate

Monthly digest — independent AI security research

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-45498

First tracked: May 20, 2026 at 02:00 PM

Classified by LLM (prompt v3) · confidence: 95%