Microsoft has removed 119 extensions from the Edge Add-ons store and suspended more than 90 developer accounts after tracing them to a single threat actor it calls StegoAd, a campaign that hid ...

New Microsoft research shows how attackers can hijack AI agents that act on a user's behalf, using nothing more than a poisoned tool description to make the agent quietly hand over company data to an ...

Microsoft Threat Intelligence has identified a malicious Chromium-based extension that spoofs the AI-powered answer engine Perplexity AI to trick unsuspecting users into installing it. Based on our ...

Microsoft has shut down a long-running malicious extension operation on the Edge Add-ons store that hid its payloads inside ordinary image and font files, then woke up days after install to steal ...

Microsoft disrupted StegoAd, a malicious browser extension campaign affecting up to 2.6 million users. StegoAd used hidden payloads, delayed execution and steganography to evade browser security ...

In the past two years, businesses have been trying to fit large language models (LLMs) into support, analytics, development, and internal automation like never before. Along with the increasing ...

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Update: Added Microsoft's statement to the article. Microsoft has quietly extended its free Windows 10 Extended Security Updates (ESU) program for consumers by an additional year, allowing enrolled ...

The package registers delegates as IHostedService instances. Use it when a startup or background task is simple enough that a dedicated hosted service class would add noise.

June 19, 2026 update: Microsoft assesses with high confidence that this activity is attributable to Sapphire Sleet, a North Korean state actor that primarily targets the financial sector. The ...

Although not the first of its kind, researchers’ POC attack against Microsoft’s M365 Copilot Enterprise underscores parameter-to-prompt (P2P) injections as a potentially broad threat. A recent ...