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Tampered Claude Code extension reached 5,000 users via Cursor marketplace

By PulseAugur Editorial · [1 sources] ·

A malicious version of the Claude Code extension, v2.1.313, was available on the Cursor IDE marketplace for approximately 11 hours. This tampered extension, which impersonated Anthropic's legitimate version, was downloaded by up to 5,000 users. Cursor has stated that the backdoor functionality within the extension required administrator privileges to activate. AI

IMPACT Highlights potential supply chain risks for AI-powered developer tools.

RANK_REASON A security incident involving a third-party tool integrated into an IDE.

Read on Mastodon — mastodon.social →

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

Tampered Claude Code extension reached 5,000 users via Cursor marketplace

How we ranked this

Signal score
10 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
A security incident involving a third-party tool integrated into an IDE.
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
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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) · [email protected] ·

    A tampered Claude Code extension, version 2.1.313, was live in Cursor's marketplace for about 11 hours and reached up to 5,000 users. It carried Anthropic's rea

    A tampered Claude Code extension, version 2.1.313, was live in Cursor's marketplace for about 11 hours and reached up to 5,000 users. It carried Anthropic's real extension ID, so it arrived as a normal update. Cursor says a key backdoor step needs admin rights. # Cybersecurity # …

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