Microsoft Defender

Microsoft Defender helps prevent, detect, and respond to attacks across devices, identities, apps, email, data, workloads, and clouds. Explore threat intelligence, capabilities, and real-world guidance to help you get more out of Defender.

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Modernize your Security Operations Center with Microsoft Sentinel
Microsoft Sentinel is a cloud-native SIEM solution powered by AI and automation that delivers intelligent security analytics across your entire enterprise.
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January 14

16 min read

Inside RedVDS: How a single virtual desktop provider fueled worldwide cybercriminal operations

Microsoft’s investigation into RedVDS services and infrastructure uncovered a global network of disparate cybercriminals purchasing and using to target multiple sectors.
January 13

7 min read

How Microsoft builds privacy and security to work hand-in-hand

Learn how Microsoft unites privacy and security through advanced tools and global compliance to protect data and build trust.
January 6

16 min read

Phishing actors exploit complex routing and misconfigurations to spoof domains

Threat actors are exploiting complex routing scenarios and misconfigured spoof protections to send spoofed phishing emails, crafted to appear as internally sent messages.
January 6

4 min read

Introducing the Microsoft Defender Experts Suite: Elevate your security with expert-led services

Announcing Microsoft Defender Experts Suite, a integrated set of expert-led services that helps security teams keep pace with modern cyberattacks.
Tailored AI insights from Microsoft Security Copilot
Empower your defenders to detect hidden patterns, harden defenses, and respond to incidents faster with generative AI.
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December 18, 2025

3 min read

New Microsoft e-book: 3 reasons point solutions are holding you back

Explore the new Microsoft e-book on how a unified, AI-ready platform delivers speed, resilience, and measurable security gains.
December 15, 2025

16 min read

Defending against the CVE-2025-55182 (React2Shell) vulnerability in React Server Components

CVE-2025-55182 (also referred to as React2Shell and includes CVE-2025-66478, which was merged into it) is a critical pre-authentication remote code execution (RCE) vulnerability affecting React Server Components and related frameworks.
December 11, 2025

3 min read

Imposter for hire: How fake people can gain very real access

Fake employees are an emerging cybersecurity threat.
December 9, 2025

10 min read

Shai-Hulud 2.0: Guidance for detecting, investigating, and defending against the supply chain attack

The Shai‑Hulud 2.0 supply chain attack represents one of the most significant cloud-native ecosystem compromises observed recently.
Go beyond data protection with Microsoft Purview
Govern, protect, and manage all of your data with Microsoft Purview, comprehensive solutions to help give you better visibility and control.
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December 9, 2025

6 min read

Changing the physics of cyber defense

Cyber defense is evolving. Find out how graph-powered strategies and AI can help organizations detect threats faster and improve security hygiene.
December 5, 2025

5 min read

Microsoft named a leader in the 2025 Gartner® Magic Quadrant™ for Email Security

Microsoft has been named a Leader in the 2025 Gartner® Magic Quadrant™ for Email Security, which we believe highlights the innovative capabilities of Microsoft Defender for Office 365.
November 18, 2025

5 min read

Agents built into your workflow: Get Security Copilot with Microsoft 365 E5

At Microsoft Ignite 2025, we are not just announcing new features—we are redefining what’s possible, empowering security teams to shift from reactive responses to proactive strategies.
November 18, 2025

9 min read

Ambient and autonomous security for the agentic era

In the agentic era, security must be ambient and autonomous, like the AI it protects. This is our vision for security, where security becomes the core primitive.