Microsoft Defender
CriticalSoftwareCVE-2026-45498
Actively exploited. Listed in CISA’s Known Exploited Vulnerabilities catalog: exploitation is observed, not theoretical.
What to do
Check the vendor advisory for the fixed version. This flaw is being actively exploited: patch now.
A denial of service flaw affects Microsoft Defender. Apply the vendor’s patch. It is being actively exploited: patch now.
What the flaw allows: The service can be knocked over cheaply.
- Ecosystem
- Application software
- Class
- Denial of service
- Published on
- May 20, 2026
Sources
Entry built automatically from the cited security advisory, with no model rewriting. Acknowledged by the organisation or vendor, notified to an authority, or established by two independent sources.