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Malicious Claude Code Extension Briefly Offered to Cursor Users

By PulseAugur Editorial · [1 sources] ·

A malicious version of the Claude Code extension was briefly available to Cursor users, affecting approximately 5,000 individuals over an 11-hour period. Cursor has identified versions 2.1.312 and 2.1.313 as compromised, clarifying that these were not developed by Anthropic. The company has issued a security notice detailing the incident and its impact. AI

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

RANK_REASON Security incident involving a third-party extension for an AI-powered tool.

Read on r/cursor →

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

Malicious Claude Code Extension Briefly Offered to Cursor Users

How we ranked this

Signal score
4 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
Security incident involving a third-party extension for an AI-powered 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/cursor TIER_2 English(EN) · /u/Odd-Guard2528 ·

    Recap: the fake Claude Code extension Cursor users were offered for about 11 hours

    <!-- SC_OFF --><div class="md"><p>In case you missed Cursor's notice from Oct 29, here's the short version. - A tampered Claude Code extension was offered to Cursor users for about 11 hours. - Cursor says versions 2.1.312 and 2.1.313 were malicious, and that Anthropic did not bui…

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