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Developers Targeted by Fake Claude Code Extension in Cursor AI Code Editor

Dark Reading · 31 Oct 2026
Key Takeaway Review the extensions installed in your developers' code editors, remove any you do not recognise or need, and only install add-ons from verified publishers.

Developers using Cursor, an AI-powered code editor, were hit by a trojanized version of a Claude Code extension, according to Dark Reading. The same day, a second serious security issue also affected the platform.

The incidents highlight the risks facing AI-powered integrated development environments (IDEs). These tools often rely on add-on extensions, and a malicious extension that looks legitimate can put developers and the systems they work on at risk.

The summary available does not provide further technical detail, such as how many users were affected or what the extension did once installed. Businesses that use Cursor or similar AI coding tools should treat this as a prompt to review which extensions their developers have installed and where those extensions came from.

Cursor supply chain malicious extension AI development tools developer security
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Summarised by CISO AI from Dark Reading, written with Claude Sonnet 5.5. We link back to every original so you can read it yourself.