Claude extension flaw enabled silent prompt injection via XSS and weak allowlist, risking data theft and impersonation until Feb 19, 2026 fix.

Microsoft Defender has been investigating reports of malicious Chromium‑based browser extensions that impersonate legitimate AI assistant tools to harvest LLM chat histories and browsing data.

How ‘Reprompt’ Attack Let Hackers Steal Data From Microsoft Copilot Your email has been sent For months, we’ve treated AI assistants like Microsoft Copilot as our digital confidants, tools that help ...

PCWorld reports on a Chrome extension called “Microsoft to Microslop” that renames Microsoft references in browsers as a protest against the company’s aggressive AI integration. The extension reflects ...

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The threat actor skill floor may soon lower as vibe coded ransomware has seemingly been published as an extension for Microsoft's AI code editor Visual Studio Code (VS Code). John Tuckner, founder of ...

Researchers at Koi Security have found that three of Anthropic’s official extensions for Claude Desktop were vulnerable to prompt injection. The vulnerabilities, reported through Anthropic's HackerOne ...

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Microsoft published a walkthrough demonstrating how to upgrade a .NET AI chat app built from the official .NET AI templates to use the new Microsoft Agent Framework. The preview framework extends ...

Workflow is still at the heart of the new framework. Building on the strengths of the Semantic Kernel and AutoGen agent implementations, the new framework offers support for workflow orchestration and ...

Microsoft is working on a new security feature for its Edge browser that will help keep users safe from harmful extensions. Normally, Edge users install extensions from the official Microsoft or ...