Act
active
Claude Code Cursor Extension Trojanized with Persistent SSH Backdoor
- Engineer — Act: If your team uses the Claude Code extension on Cursor, audit all affected machines for version 2.1.313, check ~/.ssh/authorized_keys and running SSH tunnel processes for unauthorized entries, and rotate any credentials accessible from those developer workstations.
- SOC/IR — Act: Hunt across developer endpoints for the malicious extension version 2.1.313 and sweep for unauthorized SSH key additions or anomalous outbound SSH sessions from developer machines since the update was distributed; treat any hit as a potential persistent-access incident requiring IR.
- Leader — Act: Determine whether any engineers in your organization use the Claude Code extension on Cursor; if so, initiate an IR review — a supply-chain compromise on developer tooling means potential persistent access to source code, secrets, and cloud credentials, which warrants a leadership brief before it surfaces externally.
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