Anthropic denies breach as tampered Claude Code extension hits Cursor users
A tampered extension was available in the Cursor marketplace for 11 hours, affecting up to 5,000 users. While the malicious version attempted to install backdoors on developer machines, Anthropic denies that its own systems were breached.
Key points
- Malicious extension reached 5,000 users
- Attempted to plant SSH backdoors
- Anthropic denies internal system breach
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