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

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.

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

Microsoft claims that Windows 11's built-in security tool is enough for most PC users, but that's only the case if the tool works. An issue affecting some PCs prevents security scans from being ...

Microsoft has released a new Microsoft Defender update package for Windows installation images, refreshing the security protection included with Windows setup media following the August 2026 Patch ...

Recently, Microsoft delivered its latest Defender patches for Windows 11 ISOs. These definitions are released from time to time alongside the general security updates available during Patch Tuesday.

Microsoft will distribute Defender for Endpoint EDR updates through Microsoft Update, enabling EDR security improvements to be released independently of monthly Windows operating system updates. The ...

Not quite an EDR-killer, but the proof-of-concept cyber technique creates a silent virus detection gap while service runs normally, no exploit required.

This voice experience is generated by AI. Learn more. This voice experience is generated by AI. Learn more. New warnings are a mistake. Microsoft has now confirmed that new warnings alarming Windows ...

BigDiskBuster can block Microsoft Defender updates by filling disk space, leaving detection content stale; no patch or advisory exists.