November 10, 2026 | Microsoft Security Blog

November 10 5 min read

Detecting sleeper agents hiding in AI model neurons

Microsoft Research has released new threat research detailing how a capable agent model could be turned into a sleeper agent by editing fewer than ten neurons to inject a short payload; Microsoft Research has also found that this threat is detectable by frontier agents, which can identify anomalous weight edits.
November 9 16 min read

FORGE Lab uses agentic tools to identify memory safety issues in Rust

Microsoft FORGE Lab researchers found memory-safety bugs in Rust’s core and std libraries, including cases where safe Rust code can trigger undefined behavior.
$Photo of trading team \analyzing computer data$

November 6 8 min read

ARTEX abuse expands as cybercriminals target financial sector

In October 2026, the financially motivated threat actor Storm-3358 began targeting organizations in the financial sector using the agentic AI offensive framework ARTEX.
November 5 14 min read

Threat actors use agentic AI tooling to find and abuse exposed secrets

Microsoft Threat Intelligence has observed threat actors using the agentic offensive security framework ARTEX to search GitHub for OAuth application secrets, which can be used to compromise the associated OAuth application and perform authenticated actions in the application’s tenant.
Retain Microsoft Defender Experts

Microsoft Defender Experts are available to strengthen your teams with expertise when and where you need it. Learn how to elevate your security with expert-led services.

Get started
November 5 4 min read

New investments to reduce on-premises security risk

We’re announcing a new on-premises security initiative, bringing together guidance, migration, and product investments.
November 5 4 min read

What’s new in Microsoft Security: November 2026

Microsoft Security’s November 2026 updates strengthen AI agent security, least privilege, threat protection, and exposure management.
November 5 17 min read

Email threat landscape: Q3 2026 trends and insights

Microsoft Threat Intelligence observed a sharp rise in email-based phishing activity at the end of Q3 2026 (July – September), even as QR code phishing declined, CAPTCHA-gated phishing recovered, and malicious messages spoofing familiar business-service sender domains exposed risks associated with security overrides.
November 3 14 min read

Fake-download campaign uses trojanized installers to deliver monetization payloads

Microsoft Threat Intelligence tracks a fake-download campaign that uses trojanized Inno installers to deliver multiple monetization offers and provides detection and investigation guidance across the complete installer session.
Modernize your Security Operations Center with Microsoft Sentinel

Microsoft Sentinel is a cloud-native SIEM solution powered by AI and automation that delivers intelligent security analytics across your entire enterprise.

Learn more
November 3 3 min read

Microsoft named a Leader in the 2026 Gartner® Magic Quadrant™ for AI Agent Management Platforms 

Read why Gartner named Microsoft a Leader in the inaugural 2026 Magic Quadrant for AI Agent Management Platforms.
November 2 8 min read

What exploited vulnerabilities have in common: A data-driven analysis of real-world attacks

Real-world exploitation concentrates in a small, high-impact subset of CVEs.
October 30 11 min read

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.
October 30 16 min read

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.