[Malicious Claude Code Extension Found in Cursor Marketplace, Affecting Up to 5,000 Users] Cursor posted on its X platform that a maliciously modified Claude Code VS Code extension (version 2.1.313) has appeared in its extension marketplace, affecting up to 5,000 users. This version was not developed by Anthropic. According to Cursor's security bulletin, this malicious extension collects user host information and attempts to implant an SSH backdoor. Cursor has removed the extension and recommends that users update their Claude Code extension to version 2.1.314.