Anthropic says a malicious actor used access to Cursor's marketplace to publish a "tampered" copy of the Claude Code extension, which it didn't build or publish (Felix Rieseberg/@felixrieseberg)

TechmemeOctober 31, 2026en

Felix Rieseberg / @felixrieseberg : Anthropic says a malicious actor used access to Cursor's marketplace to publish a “tampered” copy of the Claude Code extension, which it didn't build or publish — We're working with Cursor on this incident, but it wasn't a compromise of Anthropic's systems or employee laptops. A malicious actor used access to Cursor's marketplace to publish a tampered copy of the Claude Code extension, which we didn't build or publish. The versions on our official channels a...

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• Anthropic