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Backdoored Claude Code Extension Affects 5,000 Cursor Users

By PulseAugur Editorial · [1 sources] ·

A malicious browser extension for Claude Code, designed to work with the Cursor IDE, has been discovered. This extension reportedly affected up to 5,000 users, potentially exposing their data or system access. Users are advised to exercise caution with third-party extensions. AI

IMPACT Highlights security risks associated with AI tool integrations and third-party extensions.

RANK_REASON Discovery of a malicious extension for a specific AI-related tool.

Read on r/ClaudeAI →

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

Backdoored Claude Code Extension Affects 5,000 Cursor Users

How we ranked this

Signal score
3 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
Discovery of a malicious extension for a specific AI-related tool.
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. r/ClaudeAI TIER_2 English(EN) · /u/mawcopolow ·

    A backdoored Claude Code extension hit up to 5,000 Cursor users

    <table> <tr><td> <a href="https://www.reddit.com/r/ClaudeAI/comments/1xjepra/a_backdoored_claude_code_extension_hit_up_to_5000/"> <img alt="A backdoored Claude Code extension hit up to 5,000 Cursor users" src="https://external-preview.redd.it/E28VzwkL3JMQvo0G27GBOzckmNw_H-0VVXksZ…

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