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Anthropic Claude extension backdoor exposed 5,000 developer computers

By PulseAugur Editorial · [1 sources] ·

A malicious version of an official Anthropic Claude extension for the Cursor developer platform was distributed for 12 hours, potentially affecting up to 5,000 computers. The compromised version, 2.1.313, was released through Anthropic's official account and attempted to create hidden access to users' devices, enabling remote control. While Anthropic released a fixed version, neither they nor Cursor have explained how the account was compromised or issued a public warning. AI

IMPACT A security vulnerability in an AI tool could erode trust and lead to stricter vetting of AI-powered developer tools.

RANK_REASON The cluster describes a security vulnerability in a third-party tool that integrates an AI model, rather than a core AI release or research.

Read on dev.to — Anthropic tag →

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

Anthropic Claude extension backdoor exposed 5,000 developer computers

How we ranked this

Signal score
31 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
The cluster describes a security vulnerability in a third-party tool that integrates an AI model, rather than a core AI release or research.
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. dev.to — Anthropic tag TIER_1 English(EN) · Hacks.gr ·

    Anthropic plugin breach puts 5.000 computers at risk

    <p>An official Claude extension distributed via Cursor's marketplace was backdoored for 12 hours, impacting up to 5,000 developers via malicious version 2.1.313 before version 2.1.314 was released.</p> <p>Researchers confirmed the supply-chain incident, while Anthropic has not ye…

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