Recently, a handful of Windows 11 users have reported on Microsoft forums that they are repeatedly getting warnings that their PC’s security is off. It appears that a Windows 11 antivirus bug falsely ...

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 Defender from installing its own virus-definition and platform updates, ...

Microsoft has resolved a bug that caused Windows Defender to crash after a recent security update, resulting in 0xc0000005 access violation errors on some affected systems. Microsoft Defender is a ...

Just in case IT professionals needed more proof that antivirus software flaws can be some of the more dangerous around: The latest Windows Defender bug, which could allow full-system takeovers, was ...

The glitch, which Microsoft says it working to fix, creates an attacker opportunity by convincing users to ignore critical cybersecurity alerts. Microsoft on Friday reported that a glitch is causing ...