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

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 fixed the bug that made Windows Security wrongly claim Microsoft Defender Antivirus was turned off. According ...

Microsoft fixes false Defender Antivirus disabled alerts with version 4.18.26080.4, resolving the issue across supported ...

On some PCs, Windows 11 has been incorrectly warning that Microsoft Defender is turned off, even when it isn't, for almost ...

Microsoft has a new Defender anti-virus update for Windows 11 and 10 images. The new update patches several flaws. Following the one for Lumma last month, Microsoft has also published a new Defender ...

A Microsoft Defender patch bypass PoC demonstrates arbitrary file read as SYSTEM on the latest Windows version.

After installing the latest Defender Antivirus update for Windows 11, users have started reporting that their operating ...

The glitch, which Microsoft says it working to fix, creates an attacker opportunity by convincing users to ignore critical cybersecurity alerts.

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 ...

Microsoft plans to remove Defender Application Guard from Office by December 2027, starting with the February 2026 release of Office version 2602. The Microsoft Defender Application Guard for Office ...