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 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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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. 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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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. -
CNAPP evolution: How Microsoft aligns with leading cloud risk management platforms
Learn how CNAPP platforms are helping organizations prioritize exploitable risks, reduce exposure, and operationalize security across the application lifecycle. -
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. -
AutoJack: How a single page can RCE the host running your AI agent
AutoJack is a novel exploit chain showing how a single malicious webpage can turn an AI browsing agent into a remote code execution vector on the host machine. Retain Microsoft Security Experts
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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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. -
Crypto Clipper uses Tor and worm-like propagation for persistence and control
Microsoft Threat Intelligence analyzed a cryptocurrency clipper campaign that combines clipboard theft, wallet replacement, Tor-based communications, and worm-like propagation. -
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. -
Forrester names Microsoft a Leader in the 2026 Extended Detection and Response Platforms Wave™ report
Microsoft has been named a Leader in The Forrester Wave™: Extended Detection and Response Platforms, Q2 2026.
