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

CISA Known Exploited Vulnerability (KEV)

Description

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

Required action (CISA)

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

Notes

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-45498 ; https://nvd.nist.gov/vuln/detail/CVE-2026-45498

Weakness behind it

CISA has not recorded a CWE for this entry, so the CVE → CWE → CAPEC → ATT&CK chain cannot be walked from here. That is a gap in the catalogue, not evidence the vulnerability has no weakness class — check the NVD record below.

References

• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45498
• KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog