Claude Code Extension on Open VSX Weaponized to Deploy Persistent SSH Backdoor
RedSide Security October 30, 2026 Cyber Attacks 9 views
The official Claude Code extension on Open VSX was compromised to install a persistent SSH backdoor, with the trail leading to a breach of the Cursor Marketplace that forced a brief takedown.
supply chain attack
developer security
VS Code extensions
Open VSX
Cursor Marketplace
SSH backdoor
AI coding tools
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