
Poisoned Claude Code extension on Open VSX planted an SSH backdoor
Version 2.1.313 was on Cursor’s marketplace for about 11 hours; Cursor says at most 5,000 users were affected.
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Version 2.1.313 was on Cursor’s marketplace for about 11 hours; Cursor says at most 5,000 users were affected.
Flaws in Codex and VS Code remain unpatched; Cursor silently fixed code execution and GitHub fixed Copilot spoofing in 1.1.29.

The free Marketplace extension shows file edits as diffs and runs commands only after approval.

77 malicious 'evil twin' Open VSX extensions impersonated developer tools and exfiltrated hostnames and detailed workspace reconnaissance to mangorbit.com.
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