Microsoft software and cloud platforms underpin enterprise systems, so vulnerabilities and security advisories can affect identity, data, and operations.
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Background for this topic.
Microsoft is a technology company whose Windows, Microsoft 365, Azure, identity services, and developer tools form a widely deployed enterprise computing ecosystem. Its security relevance spans endpoint and server software, cloud control planes, authentication, collaboration data, and the update mechanisms used to maintain them.
Security news under this tag commonly concerns vulnerabilities requiring patching, exploits against exposed services, identity or token compromise, and misconfiguration of cloud permissions or authentication policies. Practitioners should verify affected versions and exposure, apply updates or mitigations, enforce multifactor authentication and least privilege, and monitor relevant audit logs. Incidents involving Microsoft-hosted identities or data may require rapid session and credential containment, investigation across cloud and on-premises systems, and assessment of privacy or regulatory obligations.
Microsoft's GitHub repositories have become the latest to fall victim to the ongoing Miasma self-replicating supply chain attack campaign
A Chinese espionage group tracked as UNC5221 has been accessing Microsoft 365 environments using the Brickstorm backdoor and previously undocumented malware named Plenet and AgentPSD. [...]
Microsoft Threat Intelligence identified a prompt injection pathway in Claude Code GitHub Action that allowed access to workflow secrets under specific conditions. This research examines the attack chain, responsible disclosure process, Anthropic's mitigation, and guidance for securing AI-powered CI/CD workflows. The post Securing CI/CD in an agentic world: Claude Code Github action case appeared first on Microsoft Security Blog.
When a researcher went public with Microsoft vulnerabilities, it laid bare a conflict that has never really been solved. The post Nightmare Eclipse incident shows the researcher-vendor fights may never fully go away appeared first on CyberScoop.
Cybersecurity researchers have discovered a previously unreported threat cluster dubbed OP-512 (where "OP" stands for "opponent") that has been observed targeting Microsoft Internet Information Services (IIS) servers to deploy a bespoke web shell framework
Researchers uncovered a 230-node cloud-based email relay network after the actor PCPJack accidentally exposed tools, logs, and C2 files online A threat actor tracked as PCPJack compromised 230 cloud servers across Amazon Web Services, Google Cloud, and Microsoft Azure and turned them into a covert email relay network. Hunt.io researchers discovered the operation because PCPJack […]
The threat actor known as PCPJack has hijacked cloud servers associated with Amazon Web Services (AWS), Google Cloud, and Microsoft Azure to create a covert SMTP email relay network
Also: Gas Station Monitoring Systems Under Attack, Spanish Teen Doxer ArrestedThis week, more happened than fits here: Microsoft tried to make nice with researchers, gas tank gauges under attack in the United States, fake FIFA websites are everywhere. Russia cried cyberespionage, Spanish police arrested a teenage doxer, a Oracle WebLogic flaw was actively exploited.
The Windows version of the Hola Browser has been compromised in a supply chain attack that delivered an undeclared executable identified by researchers as a cryptocurrency miner. [...]
A surge in real-world attacks against agentic AI systems is reshaping how we think about risk. Based on 12 months of red teaming, this update introduces seven new failure modes, from supply chain compromise to goal hijacking, and the practical mitigations teams need now. The post Updating the taxonomy of failure modes in agentic AI systems: What a year of red teaming taught us appeared first on Microsoft Security Blog.
Microsoft Detection and Response Team (DART) details how it has uncovered malicious AI applications as cyber criminals manipulate organizations adopting AI tools
On Wednesday, Microsoft fixed an issue that caused some Windows devices to install driver updates without notice despite policies configured to prevent auto-updates. [...]
Gamaredon exploits a WinRAR flaw to drop modular, nearly fileless malware on Ukrainian targets, hiding payloads in Windows streams and resolving C2s via Telegram. Sekoia’s Threat Detection & Research team dropped a YARA rule in late December 2025 to hunt for new initial access vectors, and by January 2026 it had already generated a dozen […]
A researcher publicly released a VS Code exploit within hours, citing past disputes with Microsoft over bug handling. The security researcher Ammar Askar found a new serious zero-day in Visual Studio Code, told a contact at GitHub about it, and published a working exploit one hour later. “Just by clicking a link, it’s possible for […]
Python scripts were used to test malware against endpoint detection and response agents from Sophos, CrowdStrike, and Windows Defender.
Healthcare Sector AI Expansion Raises Questions on Governance, Privacy and SafetyMayo Clinic and Microsoft are planning a new healthcare-specific frontier artificial intelligence model that aims to help clinicians make earlier diagnoses and deliver more personalized treatments to their patients. The clinic plans to make the new model available to patients and doctors.
A single poisoned notification from WhatsApp, Slack, SMS, Signal, Instagram, or Messenger could have hijacked Google Gemini's voice assistant on Android and made it open a victim's connected windows, fake a message from their boss, push the phone into a Zoom call, or quietly poison its long-term memory
A disabled security setting meant to protect authentication across Android versions of key apps like Word, PowerPoint, and Excel paved the way for attackers to steal logins and data.
Cybersecurity researchers have disclosed a one-click attack via Microsoft Visual Studio Code (VS Code) that makes it possible to steal a user's GitHub token
A development flag left switched on in production builds of several Microsoft 365 Android apps disabled the check that limits account-token sharing to trusted Microsoft apps