ShieldBreak is a claimed patch bypass for Defender flaw CVE-2026-50656, with a PoC tested on Windows 11 25H2 and Server 2025.

Security researchers reproduced ShieldBreak, a claimed Windows Defender zero-day that manipulates cloud hydration and ...

Nightmare Eclipse has dropped ShieldBreak, a Windows zero-day exploit that allows any user to gain System privileges.

A patch Microsoft released on Wednesday to fix a zero-day vulnerability in its Defender security engine may cause Windows machines to write files large enough to completely consume available disk ...

For most people using a supported and fully updated Windows 11 computer, yes: Microsoft Defender Antivirus and the other protections inside Windows Security are sufficient as the primary antivirus.

Microsoft this week announced that its Microsoft Defender Vulnerability Management solution can now scan Windows devices that are lacking certain agent support. This capability, called "authenticated ...

Microsoft announced on Thursday that it has added agentless malware scanning for servers hosting virtual machines. The new agentless malware scanning capability is available to organizations that have ...

In a proof-of-concept, a security researcher demonstrated how the Windows Security Center API can be used to block the scans by Microsoft’s built-in antivirus tool. Windows Defender can be tricked ...

Scan and clean your PC with the Windows Malicious Software Removal Tool. Learn how to run it, check results, and remove active malware fast.

Learn how BitLocker, passkeys, Microsoft Defender, and other Windows 11 security features protect your data, accounts, apps, and devices.