Threat actors are using three publicly available proof-of-concept exploits to attack Microsoft Defender and turn the security platform's primary cleanup and protection functions against organizations ...

Two zero-day flaws in Microsoft Defender, the antivirus engine built into every Windows installation, are already being ...

Update 5/21: Since this article was released, recommend mitigations for YellowKey and other attacks have been released, as well as a full patch for BlueHammer. A cyber security expert that goes by the ...

Forbes contributors publish independent expert analyses and insights. Davey Winder is a veteran cybersecurity writer, hacker and analyst. This voice experience is generated by AI. Learn more. This ...

Although the team with Microsoft moved swiftly to patch the BlueHammer vulnerability, other exploits still threaten Microsoft Defender and Windows users. No less than ...

Microsoft pushed out-of-band patches on May 21, 2026, for two actively exploited Windows Defender zero-days — one that lets a low-privileged attacker seize full SYSTEM-level control of any Windows ...

All modern Windows PCs come with Microsoft Defender built in. For the unaware, this tool is Windows’ native antivirus. Over time, it has matured into a reliable security tool capable of blocking a ...

A researcher known as "Nightmare Eclipse" has published a proof-of-concept exploit for a second Microsoft Defender zero-day, dubbed "RedSun," in the past two weeks, protesting how the company works ...

The long-running feud between Microsoft and security researcher Nightmare Eclipse has entered a new chapter. Eclipse, who has spent the past several months publicly releasing unpatched Windows ...

AI thrives on data but feeding it the right data is harder than it seems. As enterprises scale their AI initiatives, they face the challenge of managing diverse data pipelines, ensuring proximity to ...