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Claude Code Extension backdoor found in Cursor+ marketplace

By PulseAugur Editorial · [1 sources] ·

A security vulnerability has been discovered in the Claude Code Extension, available through Cursor+'s marketplace. A compromised version of the extension was found to install an SSH key and a startup job upon loading the editor. This backdoor persists even after updating the extension, posing a risk to users who have installed the affected build. AI

IMPACT Users of the Claude Code Extension via Cursor+ should verify their installation to avoid potential security risks.

RANK_REASON Security vulnerability discovered in a third-party tool/extension.

Read on Towards AI →

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

Claude Code Extension backdoor found in Cursor+ marketplace

How we ranked this

Signal score
29 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
Security vulnerability discovered in a third-party tool/extension.
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. Towards AI TIER_1 English(EN) · Hubert Nakielski ·

    How to Check for the Claude Code Extension Backdoor From Cursor’s Marketplace, and Remove It

    <div class="medium-feed-item"><p class="medium-feed-image"><a href="https://pub.towardsai.net/how-to-check-for-the-claude-code-extension-backdoor-from-cursors-marketplace-and-remove-it-1c881ad0ac4c?source=rss----98111c9905da---4"><img src="https://cdn-images-1.medium.com/max/2000…

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