Fake Claude Code Extension Attempted to Open Backdoor

Tier D · Background noise – Good to know

Who’s exposed: Users who installed the fake Claude Code extension

Tier D because: Does not hit tech teams

Reach

Attack

Damage

Fix

Exploited in the wild

What to do

Check installed editor extensions and remove any Claude Code extension that does not come from the official publisher

The Brief

A fake Claude Code extension attempted to open a backdoor on users' PCs.
Real Python's weekly AI news for October 31–November 6, 2026 reported the incident.

Developers who install AI coding tool extensions can be targeted by impostors, so an unofficial extension can compromise a machine.

Checklist · 1 of 10 yes

No	Hits tech teams	Judgment: a fake impersonating extension is a scam aimed at developers, not a product developers build with or run.
No	Core infrastructure	Judgment: the impersonated Claude Code brand is not core infrastructure; the fake extension is not shared infrastructure.
No	Popular tool	Judgment: Claude Code is popular, but this is an impersonation, so the flaw is not in the real popular tool.
Yes	Exploited in the wild	Real Python: a fake Claude Code extension tried to open a backdoor on users' PCs, an actual malware campaign.
No	Public exploit	Real Python headline gives no mention of published exploit code or proof-of-concept.
No	Remote, no login	Real Python does not say the attack works over the network without credentials or user interaction.
No	Full takeover	Real Python says the extension tried to open a backdoor; no source confirms successful code execution or takeover.
No	Secrets exposed	Real Python reports no stolen credentials, tokens, keys, or source code.
No	Supply chain	Real Python: malware disguised as a Claude Code extension, spread outside official channels; not a compromised legitimate project.
No	No fix yet	Real Python reports a malicious impersonating extension, not a vulnerability, so no patch applies.

First seen 3h ago · 1 source · Full story page · How tiers are decided