A tampered Claude Code extension on Cursor's marketplace planted an SSH backdoor (phorion.io)
No click was needed: the moment Node loaded the extension, it added an attacker's key labelled "svc-telemetry" to ~/.ssh/authorized_keys and opened a reverse SSH tunnel to an outside server. Uninstalling it doesn't remove the persistence.
Anthropic says someone with access to Cursor's marketplace published the tampered copy, so readers argued over whose incident this is.