Anthropic: That Claude Code extension compromise… couldn't be us
A tampered version of the extension containing an SSH backdoor infected up to 5,000 developers. Anthropic stated the attack involved unauthorized access to Cursor's marketplace rather than a compromise of Anthropic's laptops or systems.
Key points
- Malicious extension infected up to 5,000 developers
- Contained a persistent SSH backdoor for multiple OS
- Anthropic confirms its own systems were not breached
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