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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December 15

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

3 min read

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

Fake employees are an emerging cybersecurity threat.
December 9

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.
December 9

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.
Prevent threats with Microsoft Defender
The Microsoft Defender family offers comprehensive threat prevention, detection, and response capabilities for everyone—from individuals looking to protect their family to the world’s largest enterprises.
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December 5

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

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

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.
November 6

4 min read

New IDC research highlights a major cloud security shift

New IDC research shows why CISOs must move toward AI-powered, integrated platforms like CNAPP, XDR, and SIEM to reduce risk, cut complexity, and strengthen resilience.
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Microsoft Security Experts are now available to strengthen your team with managed security services. Learn how to defend against threats with security experts.
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November 4

4 min read

Learn what generative AI can do for your security operations center

This new e-book showcases what generative AI can do for your SOC, from reducing alert fatigue and enabling quicker triage to getting ahead of cyberattacks with proactive threat hunting, and more.
November 3

10 min read

SesameOp: Novel backdoor uses OpenAI Assistants API for command and control

Microsoft Incident Response – Detection and Response Team (DART) researchers uncovered a new backdoor that is notable for its novel use of the OpenAI Assistants Application Programming Interface (API) as a mechanism for command-and-control (C2) communications.
October 30

5 min read

The 5 generative AI security threats you need to know about detailed in new e-book

In this blog post, we’ll highlight the key themes covered in the e-book, including the challenges organizations face, the top generative AI threats to organizations, and how companies can enhance their security posture to meet the dangers of today’s unpredictable AI environments.
October 23

5 min read

Harden your identity defense with improved protection, deeper correlation, and richer context

Expanded ITDR features—including the new Microsoft Defender for Identity sensor, now generally available—bring improved protection, correlation, and context to help customers modernize their identity defense.

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