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Malicious Claude Code extension in Cursor attempted to backdoor 5,000 developers

By PulseAugur Editorial · [1 sources] ·

A malicious Claude Code extension for the Cursor IDE was discovered on October 29th, attempting to install an SSH backdoor on up to 5,000 developer machines. The extension, named Claude Code, was available in Cursor's marketplace and aimed to compromise user systems. Instructions are available on how to detect and remove the malicious code. AI

IMPACT Highlights security risks associated with AI-powered coding tools and their distribution platforms.

RANK_REASON Discovery of a malicious extension within a software development tool's marketplace.

Read on Mastodon — mastodon.social →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Malicious Claude Code extension in Cursor attempted to backdoor 5,000 developers

How we ranked this

Signal score
11 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
Discovery of a malicious extension within a software development tool's marketplace.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
product, safety
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. Mastodon — mastodon.social TIER_1 English(EN) · madrobotblog ·

    A hacked Claude Code extension in Cursor tried to backdoor up to 5,000 developers’ computers A malicious Claude Code extension in Cursor’s marketplace on Oct 29

    A hacked Claude Code extension in Cursor tried to backdoor up to 5,000 developers’ computers A malicious Claude Code extension in Cursor’s marketplace on Oct 29 tried to plant an SSH backdoor on up to 5,000 machines. How to check and clean up. # ClaudeCode # Infosec # AI https://…

    LINKS madrobot.blog/…/cursor-claude-code-extens…

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