Trojanized Claude Code Extension Distributed via Cursor Marketplace with Persistent SSH Backdoor
Original headline: Official Claude Code Extension on Cursor Marketplace Trojanized with Persistent SSH Backdoor
Security researchers reported that a trojanized version of Anthropic’s official Claude Code extension was distributed through the Cursor Marketplace as a legitimate update. The malicious version 2.1.313 attempted to install a persistent SSH backdoor on victim systems. The update was signed under the legitimate publisher’s identity, prompting Cursor to temporarily suspend the marketplace.
The incident highlights the growing supply-chain risk of AI development tools.
Research angleHow do supply-chain attacks on AI plugins affect developers’ security compliance intentions? — Protection Motivation Theory