// AI news · 2026-10-31 · Wired
Malicious Claude Extension Found in Cursor Marketplace
A malicious Anthropic Claude Code extension was briefly published in Cursor's marketplace, accessible on Windows, macOS, and Linux.
Published 2026-10-31 04:38 (Beijing time)Source WiredAuto-summarised, fact-checked against source
01Summary
It contained a backdoor for device access but failed to fully establish itself due to design flaws. The version was not developed by Anthropic and was uploaded via Cursor’s marketplace by an external actor. Official Anthropic channels remain unaffected.
Summarised from the original article by an open-source model, then checked automatically: every number and English name must appear in the source. The original article is authoritative.
02Key points
- Malicious Claude Code extension briefly published in Cursor marketplace.
- Contained a backdoor but failed to fully establish on most devices.
- Not developed or published by Anthropic; uploaded via Cursor marketplace.
- Official Anthropic channels are unaffected and secure.
03Source
A Supply Chain Attack Put Malicious Anthropic Claude Extensions on Thousands of Devices
Wired · published 2026-10-31 04:38 Beijing time
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