Claude Code VS Code extension: trojanized

Claude Code VS Code extension

A malicious version of the Claude Code VS Code extension was published, delivering a persistent SSH backdoor to developer machines.

Do this now

Check the vendor's advisory for a fix, remove the extension, and check machines for an SSH backdoor.

First seen: 30 Oct 2026
Last update: 30 Oct 2026, 09:18 UTC
Source: news
On the menu as: VS Code extensions

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Claude Code VS Code extension: trojanized
Severity: unknown. Patch status: fix status unknown.
Affected: Claude Code VS Code extension

A malicious version of the Claude Code VS Code extension was published, delivering a persistent SSH backdoor to developer machines.

## Steps
1. Search the repo, its CI and infra config for Claude Code VS Code extension. If present, report the version in use and whether it's affected.
2. No source names a fix yet; check the vendor advisory. Until one ships: restrict network access to it.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://www.stepsecurity.io/blog/claude-code-extension-trojanized
https://pwned.coffee/i/claude-code-vs-code-extension-trojanized

Receipt

Exploitation: No known exploitation
Score: No CVSS published yet: severity unknown.
Last checked: 30 Oct 2026, 10:54 UTC

Sources: KEV – CVE record – Vendor –

Sources

stepsecurity.io: Trojanized Claude Code Extension Delivered Persistent SSH Backdoor to Developer Machines

Wrong fix version, or a source we missed? Send it back to chef@pwned.coffee with the source, and we'll correct it here.

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