medium4.0Known exploited
CVE-2026-45498
Microsoft Defender Denial of Service Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-05-20. Federal due date: 2026-06-03.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Impact
Microsoft Defender contains an unspecified vulnerability that allows for denial of service.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Defender Antimalware Platform | before 4.18.26040.7 |