CVE-2026-45498 — Microsoft Defender: Microsoft Defender Denial of Service Vulnerability
CVE-2026-45498 — Microsoft Defender contains an unspecified vulnerability that allows for denial of service.
What This Means For You
- CISA has confirmed active exploitation — immediate patching required.
- Added to CISA KEV catalog — federal agencies must remediate by 2026-06-03.
Related ATT&CK Techniques
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-45498 | DoS | Microsoft Defender |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | CISA |
| Channel | CISA KEV |
| Channel ID | cisa-kev |
| Message ID | 202645498 |
| Published | May 20, 2026 at 15:00 UTC |
| Original Link | https://msrc.microsoft.com/update-guide/en-US/vulnerabili... |
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