Malicious Claude Code extension in Cursor's marketplace attempted remote access and data theft
Malicious Claude Code extension in Cursor's marketplace attempted remote access and data theft
Malicious Claude Code extensions on the Cursor market attempt to remotely access and steal data, affecting up to 5000 users. The extension attempts to collect users' hostnames, usernames, operating systems, and public IP addresses, and attempts to set up remote access for attackers, but Cursor states this is likely to fail on most machines. Cursor immediately removed the extension and shut down the entire market after discovery. The market has been restored after cooperating with the provider to eliminate the malware and confirming no further risk.
Heads up if you recently installed the Claude Code extension for Cursor. A tampered version was available in the Cursor VS Code extension marketplace on Thursday for about eleven hours, affecting up to 5,000 users, according to the company. Anthropic had no involvement in developing it.
The extension tried to harvest user data like hostname, username, operating system, and public IP address. It also attempted to set up remote access for the attacker, though that likely wouldn't have worked on most machines since it requires admin privileges, Cursor says. Once discovered, Cursor pulled the extension and took the entire marketplace offline. After working with providers to neutralize the malware and confirming there was no further risk, the marketplace was reinstated. Cursor says no other extensions were affected.
AI News Without the Hype – Curated by Humans
Subscribe to THE DECODER for ad-free reading, a weekly AI newsletter, our exclusive "AI Radar" frontier report six times a year, full archive access, and access to our comment section.
Source: The Decoder · the-decoder.com