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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Inside a malicious Claude Code-branded extension and its persistent SSH backdoor
Microsoft analyzes a malicious Claude Code–branded extension, its persistent SSH backdoor, and guidance to detect and remediate it. -
From help desk impersonation to AD CS abuse: Investigating ESC1 and ESC8 intrusion paths
Teams support impersonation led to remote access, malicious runtime execution, and Certificate Services abuse through authentication relay and Kerberos. -
Tracking AI adoption in North Korean threat actor tradecraft
As Microsoft Threat Intelligence continues to track how threat actors operationalize AI to increase the speed and efficiency of attacks, we’ve identified North Korean threat actors expanding their use of AI with varying levels of adoption.
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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Inside a malicious Claude Code-branded extension and its persistent SSH backdoor
Microsoft analyzes a malicious Claude Code–branded extension, its persistent SSH backdoor, and guidance to detect and remediate it. -
The CISO’s evolving role: Protecting and defending in the agentic era
As AI and agents reshape the enterprise, CISOs face two critical priorities: enabling innovation with the right identity and data guardrails, and modernizing defense to keep pace with AI-powered threats. -
Inside the LiteLLM 1.107.0 supply chain compromise: Credential theft through Python startup hooks
Microsoft Threat Intelligence analyzes the LiteLLM 1.
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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Inside a malicious Claude Code-branded extension and its persistent SSH backdoor
Microsoft analyzes a malicious Claude Code–branded extension, its persistent SSH backdoor, and guidance to detect and remediate it. -
From help desk impersonation to AD CS abuse: Investigating ESC1 and ESC8 intrusion paths
Teams support impersonation led to remote access, malicious runtime execution, and Certificate Services abuse through authentication relay and Kerberos. -
Tracking AI adoption in North Korean threat actor tradecraft
As Microsoft Threat Intelligence continues to track how threat actors operationalize AI to increase the speed and efficiency of attacks, we’ve identified North Korean threat actors expanding their use of AI with varying levels of adoption. -
IDC MarketScape names Microsoft a Leader in the 2026 Worldwide Modern Endpoint Security for Enterprises Vendor Assessment
IDC has named Microsoft a Leader in the 2026 IDC MarketScape for Worldwide Modern Endpoint Security for Enterprises. -
The CISO’s evolving role: Protecting and defending in the agentic era
As AI and agents reshape the enterprise, CISOs face two critical priorities: enabling innovation with the right identity and data guardrails, and modernizing defense to keep pace with AI-powered threats. -
Inside the LiteLLM 1.107.0 supply chain compromise: Credential theft through Python startup hooks
Microsoft Threat Intelligence analyzes the LiteLLM 1.