Over the weekend, security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) released another Microsoft Defender zero-day exploit that blocks antivirus updates.

Microsoft has resolved a known issue that causes incorrect alerts warning that Defender Antivirus was turned off after installing recent updates.

A researcher who calls himself Nightmare Eclipse published a free tool on September 19, 2026, that can quietly stop Windows ...

Microsoft Defender security intelligence update 1.459.576.0 is rolling out under KB2267602. Here is how to check your version ...

Microsoft has a new Defender anti-virus update for Windows 11 and 10 images. The new update patches several flaws.

Want to know how to enable Windows Defender in Windows 11? In this easy step-by-step tutorial, I’ll show you how to turn on Windows Defender Antivirus and check your Windows Security settings to help ...

Microsoft released a new Defender update for Windows 10 and 11 ISO images. According to the company, this update must be deployed across all new Windows 11 and 10 installs. This past week Microsoft ...

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 ...

BigDiskBuster is a new Microsoft Defender zero-day that can block platform and signature updates across supported Windows versions.

Even though Windows tells you “You’re using the latest version”, the last updated date is a few days old. That makes it easy for regular users to think ...

The majority of the updates that come through Windows Update are for Windows Defender, and for good reason. Windows Defender helps make your antimalware and other security protections stronger.