Actionable threat insights

Get timely insights into emerging vulnerabilities, first‑finder discoveries, and evolving cyberattacker behaviors. Explore deep research and real‑world Microsoft Defender scenarios that show how proactive detection and quick action help organizations prevent compromise.

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Tailored AI insights from Microsoft Security Copilot

Empower your defenders to detect hidden patterns, harden defenses, and respond to incidents faster with generative AI.

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July 23 17 min read

Email threat landscape: Q2 2026 trends and insights

In the second quarter of 2026, the continuing effects of Microsoft’s disruption of the Tycoon2FA phishing platform contributed to sustained declines in several major phishing techniques, while threat actors expanded into Teams-based social engineering and employed increasingly automated and multi-stage attack chains.
July 16 12 min read

ACR Stealer: Two observed intrusion chains amid increased threat activity

From late April 2026 to mid-June 2026, Microsoft Defender Experts observed increased ACR Stealer activity across customer environments.
July 16 6 min read

Least privilege for AI agents: Identity, access, and tool binding

As AI agents become more autonomous, strong identity, access, and auditing controls are critical to keeping them secure.
July 15 13 min read

Unpacking the AsyncAPI npm supply chain compromise and import-time payload delivery

Threat actors compromised AsyncAPI packages and weaponized trusted CI/CD workflows to distribute malware through npm.
Go beyond data protection with Microsoft Purview

Govern, protect, and manage all of your data with Microsoft Purview, comprehensive solutions to help give you better visibility and control.

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July 15 3 min read

Turning threat intelligence into decisive action with Defender Experts

Security teams have never had more visibility, yet rarely have they felt more uncertain.
July 13 9 min read

Defending SaaS-based applications against ShinyHunters OAuth abuse

Microsoft Threat Intelligence identified threat actor activity with overlapping tradecraft commonly associated with ShinyHunters, including voice phishing (vishing), supply-chain compromise, and misconfigured guest access targeting SaaS-based applications.
July 8 8 min read

Protecting Microsoft at AI speed: How SFI proactively hardens our cloud

At Microsoft we encompass these security requirements, along with threat knowledge, and operational frameworks in our Secure Future Initiative (SFI), to guide what a well-defended cloud service looks like.
June 30 6 min read

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.
Streamline privacy management with Microsoft Priva

Protect and govern personal information, reduce privacy risks, and manage subject rights requests at scale with Microsoft Priva privacy risk management solutions.

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June 29 9 min read

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.
June 25 33 min read

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.
June 24 19 min read

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.
June 22 6 min read

Guarding AI memory

What happens when threat actors target what AI remembers? Microsoft breaks down the risks and the defenses.