Microsoft Security Blog
Your source for the latest in cybersecurity
Beyond the benchmark: Advancing security at AI speed
Read how Microsoft Security has advanced its agentic vulnerability detection system, codename MDASH, integrating into real-world workflows across Windows, Azure, and identity systems.
What’s new in Microsoft Security: June 2026
This month’s updates help security and IT teams strengthen identity and multicloud foundations, protect data wherever it lives, and secure the developer workflows powering AI innovation.
Microsoft Build 2026: Securing code, agents, and models across the development lifecycle
Discover how Microsoft enables fast, secure AI development with MDASH and new security capabilities.
Microsoft is named a Leader in the 2026 Gartner® Magic Quadrant™ for Endpoint Protection
Microsoft is named a Leader in the 2026 Gartner® Magic Quadrant™ for Endpoint Protection.
What’s new in Microsoft Security: May 2026
Microsoft Security’s latest updates extend visibility, control, and protection across expanding ecosystems as organizations accelerate AI adoption.
Microsoft is named a Leader in the 2026 Gartner® Magic Quadrant™ for Endpoint Protection
Microsoft is named a Leader in the 2026 Gartner® Magic Quadrant™ for Endpoint Protection.
Microsoft recognized as a Leader in The Forrester Wave™ for Workforce Identity Security Platforms
Microsoft has been recognized as a Leader in The Forrester Wave™: Workforce Identity Security Platforms, Q2 2026, receiving the highest scores in both the current offering and strategy categories.
Securing our future: April 2025 progress report on Microsoft’s Secure Future Initiative
The Microsoft Secure Future Initiative (SFI) stands as the largest cybersecurity engineering project in history and most extensive effort of its kind at Microsoft.
New whitepaper outlines the taxonomy of failure modes in AI agents
Read the new whitepaper from the Microsoft AI Red Team to better understand the taxonomy of failure mode in agentic AI.
Microsoft extends Zero Trust to secure the agentic workforce
At Microsoft Build 2025, we’re taking important steps to secure the agentic workforce.
Threat intelligence
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StealC and Amadey: Breaking down infostealers and the cybercrime services that deliver them
On June 24, 2026, Microsoft’s Digital Crimes Unit (DCU) facilitated the takedown, suspension, and blocking of domains that formed the backbone of the StealC and Amadey infrastructure. -
From package to postinstall payload: Inside the Mastra npm supply chain compromise by Sapphire Sleet
A poisoned npm package infected 140+ projects with a hidden payload. -
AI brands as bait: How threat actors are using the AI hype in social engineering
As threat actors operationalize AI to accelerate attacks, they are also leveraging the wider global interest around AI itself as a social engineering lure.
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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What’s new in Microsoft Security: June 2026
This month’s updates help security and IT teams strengthen identity and multicloud foundations, protect data wherever it lives, and secure the developer workflows powering AI innovation. -
Securing AI agents: When AI tools move from reading to acting
MCP tool poisoning turns trusted AI agents into a control plane for data loss. -
Chromium extension uses AI‑related branding to redirect browser search
A malicious Chromium-based extension that spoofs the AI-powered answer engine Perplexity AI redirects browser search traffic using MV3 APIs and intermediary infrastructure.
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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Accelerating the quantum-safe timeline
We’re accelerating quantum-safe readiness—and sharing what organizations can do now to transition earlier and with confidence. -
What’s new in Microsoft Security: June 2026
This month’s updates help security and IT teams strengthen identity and multicloud foundations, protect data wherever it lives, and secure the developer workflows powering AI innovation. -
Securing AI agents: When AI tools move from reading to acting
MCP tool poisoning turns trusted AI agents into a control plane for data loss. -
Chromium extension uses AI‑related branding to redirect browser search
A malicious Chromium-based extension that spoofs the AI-powered answer engine Perplexity AI redirects browser search traffic using MV3 APIs and intermediary infrastructure. -
Photo ZIP campaign targeting hospitality industry delivers Node.js implant for persistent access
Microsoft Threat Intelligence identified an active multi-stage intrusion campaign targeting hospitality organizations in Europe and Asia. -
Microsoft a Leader in The Forrester Wave™ for Endpoint Management Platforms
Microsoft named a Leader in the Forrester Wave™: Endpoint Management Platforms, Q2 2026, with the highest scores in the current offering and strategy categories.