DEEPWING · ENGLISH EDITION

INC-054: A tampered Claude Code extension sat in Cursor's marketplace for about 11 hours: two versions tried to plant a persistent SSH backdoor, Cursor says Anthropic did not build them, and Microsoft confirms official channels were not affected · DeepWing Case Library

DeepWing Case Library, case INC-054. Primary failure layer: Access Control. Evidence grade: Primary-source verified. What happened, why it failed, and the gate that should have caught it.

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