
Malicious Claude Code Extension Served in Cursor Supply Chain Attack
Malicious versions 2.1.312 and 2.1.313 of the anthropic.claude-code extension were live in the Cursor VS Code Extension Marketplace for about 11 hours on October 29. The JavaScript ran at module load, collected host details, tried to install an SSH key, open a reverse SSH tunnel and set persistence on macOS and Windows. Kevin Beaumont estimates about 5,000 downloads. Cursor rotated keys, rebuilt the marketplace and published a detection script and IoCs; uninstalling alone does not remove the dropped persistence scripts.
Supply Chain, Threat IntelΒ· Published and added 2 Nov 2026































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