Microsoft Security Blog
Your source for the latest in cybersecurity
Featured Posts
Agents are your newest insiders. Security must move at their speed.
New capabilities in Microsoft 365 E7 and Project Perception help organizations contain agent risk and adapt protection continuously.
Managing open-weight model risk in enterprise deployments
New whitepaper from Microsoft and NVIDIA helps enterprises manage open-weight AI model risks with a shared taxonomy, evaluations, and controls.
Secure what’s next: Your guide to Microsoft Security at Microsoft Ignite 2026
This year at Microsoft Ignite, we spotlight our AI-first, end-to-end security platform designed to protect identities, devices, data, applications, clouds, infrastructure, and the AI agents now working alongside your teams.
Insights from the 2026 Microsoft Digital Defense Report
Read highlights from the 2026 Microsoft Digital Defense Report, which reflects a security environment that continues to grow more interconnected.
Threat intelligence
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The hidden network: Inside the phishing infrastructure ecosystem powering global cybercrime
Microsoft uncovered a Chinese-language cybercriminal ecosystem, an interconnected network of phishing kit operators (tracked as Storm-2990), and an illicit marketplace (tracked as Storm-3119) selling tools and infrastructure for large-scale phishing. -
Unauthenticated command injection on internet-facing mail servers: tracking CVE-2026-73570
Microsoft Threat Intelligence examines CVE-2026-73570 exploitation in Zimbra, including observed attack paths, detection opportunities, and mitigation guidance. -
Phishing Abuses RMM Tools for Persistent Access
Microsoft observed phishing campaigns that abused MSP360 RMM to deploy ScreenConnect, creating redundant remote-access channels for follow-on activity
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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Agents are your newest insiders. Security must move at their speed.
New capabilities in Microsoft 365 E7 and Project Perception help organizations contain agent risk and adapt protection continuously. -
Managing open-weight model risk in enterprise deployments
New whitepaper from Microsoft and NVIDIA helps enterprises manage open-weight AI model risks with a shared taxonomy, evaluations, and controls. -
3 lessons from frontier AI vulnerability research
Read how How Microsoft Security’s FORGE Lab is scaling vulnerability research from Windows to the Linux kernel.
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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Agents are your newest insiders. Security must move at their speed.
New capabilities in Microsoft 365 E7 and Project Perception help organizations contain agent risk and adapt protection continuously. -
Managing open-weight model risk in enterprise deployments
New whitepaper from Microsoft and NVIDIA helps enterprises manage open-weight AI model risks with a shared taxonomy, evaluations, and controls. -
The hidden network: Inside the phishing infrastructure ecosystem powering global cybercrime
Microsoft uncovered a Chinese-language cybercriminal ecosystem, an interconnected network of phishing kit operators (tracked as Storm-2990), and an illicit marketplace (tracked as Storm-3119) selling tools and infrastructure for large-scale phishing. -
Post-quantum authentication: Why organizations should start testing certificate ecosystems now
Prepare for post-quantum authentication by testing certificate ecosystems now. -
3 lessons from frontier AI vulnerability research
Read how How Microsoft Security’s FORGE Lab is scaling vulnerability research from Windows to the Linux kernel. -
CISO perspectives on managing vulnerability risks in the age of AI
Learn how CISOs can mitigate cybersecurity risks and increase resilience in the age of AI-powered vulnerability management.