Microsoft Security Blog
Your source for the latest in cybersecurity
Microsoft announces the 2026 Security Excellence Awards winners
Congratulations to the winners of the 2026 Microsoft Security Excellence Awards that recognize the innovative defenders who have gone above and beyond.
Microsoft Security success stories: Why integrated security is the foundation of AI transformation
Discover how Ford, Icertis, and TriNet modernized security with Microsoft—embedding Zero Trust, automating defenses, and enabling secure AI innovation at scale.
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.
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.
Threat intelligence
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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. -
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. -
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.
Stay ahead of threats
Get expert insights, threat intelligence, and the latest cybersecurity reports from Security Insider.
AI and machine learning
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Detecting backdoored language models at scale
We’re releasing new research on detecting backdoors in open-weight language models and highlighting a practical scanner designed to detect backdoored models at scale and improve overall trust in AI systems. -
Microsoft SDL: Evolving security practices for an AI-powered world
Discover Microsoft’s holistic SDL for AI combining policy, research, and enablement to help leaders secure AI systems against evolving cyberthreats. -
New Microsoft Data Security Index report explores secure AI adoption to protect sensitive data
The 2026 Microsoft Data Security Index explores one of the most pressing questions facing organizations today: How can we harness the power of generative while safeguarding sensitive data?
Modernize your security operations center
Confidently secure your multicloud, multiplatform environment with Microsoft Sentinel – a cloud-native security information and event management (SIEM) solution.
Latest posts
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Detecting backdoored language models at scale
We’re releasing new research on detecting backdoors in open-weight language models and highlighting a practical scanner designed to detect backdoored models at scale and improve overall trust in AI systems. -
Microsoft SDL: Evolving security practices for an AI-powered world
Discover Microsoft’s holistic SDL for AI combining policy, research, and enablement to help leaders secure AI systems against evolving cyberthreats. -
Infostealers without borders: macOS, Python stealers, and platform abuse
How modern infostealers target macOS systems, leverage Python‑based stealers, and abuse trusted platforms and utilities to distribute credential‑stealing payloads. -
Case study: Securing AI application supply chains
Securing AI-powered applications requires more than just safeguarding prompts. -
Turning threat reports into detection insights with AI
Security teams often spend days manually turning long incident reports and threat writeups into actionable detections by extracting TTPs. -
New Microsoft Data Security Index report explores secure AI adoption to protect sensitive data
The 2026 Microsoft Data Security Index explores one of the most pressing questions facing organizations today: How can we harness the power of generative while safeguarding sensitive data?