Over the weekend, security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) released another Microsoft Defender zero-day exploit that blocks antivirus updates.
Morning Overview on MSN
New zero-day bug can silently block Windows Defender’s virus updates
A researcher who calls himself Nightmare Eclipse published a free tool on September 19, 2026, that can quietly stop Windows ...
BigDiskBuster can block Microsoft Defender updates by filling disk space, leaving detection content stale; no patch or advisory exists.
Microsoft has resolved a known issue that causes incorrect alerts warning that Defender Antivirus was turned off after installing recent updates.
Microsoft has fixed the bug that made Windows Security wrongly claim Microsoft Defender Antivirus was turned off. According ...
IntroductionOn September 23, 2026, Microsoft released a preview of a new feature for its security product, Microsoft Defender ...
After installing the latest Defender Antivirus update for Windows 11, users have started reporting that their operating ...
Windows Report on MSN
Microsoft Fixes Windows Bug That Falsely Warned Defender Was Disabled
Microsoft fixes false Defender Antivirus disabled alerts with version 4.18.26080.4, resolving the issue across supported ...
Microsoft on September 23, 2026, announced the integrated security operations center (ISOC) in Microsoft Defender, a ...
We are announcing ISOC in Microsoft Defender: a foundation built for agentic security that brings leading solutions for SIEM and threat protection together.
Microsoft is combining its security information and event management and threat protection capabilities inside Microsoft Defender, creating what the company calls an Integrated Security Operations ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results