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Backdoor in Claude Code for VS Code extension on the Cursor Marketplace

690 points • by _chall • today at 7:09 AM • 435 comments • view on HN

https://cursor.com/blog/claude-code-extension-security-notic...


Comments

vanbashan • today at 3:05 PM

Is it related to today binance event?

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soundworlds • today at 1:32 PM

The descriptions around this are very confusing. Is this specifically the Cursor version, or the regular VS Code version too?

madarao • today at 7:58 PM

Let me guess, they vibe coded their vibe coding extension?

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nubinetwork • today at 11:34 AM

It looks like they push an update every office day. I'm guessing if I installed 6 months ago and didn't update, that I should be fine?

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shahbaby • today at 2:18 PM

I think right now AI is helping the attackers more than it's helping the defenders.

That part is probably obvious.

But in the long term, I suspect this will get worse.

Attackers will still need to think critically to be a few steps ahead of the defenders.

But the defenders will increasingly outsource their thinking to AI as they are incentived if not outright forced to dumb themselves down into interchangeable cogs.

kirth_gersen • today at 1:21 PM

This is why when I use AI, I still download from the browser and drag and drop the outputted files like a caveman. Sure, it's slower, but it keeps my mental model more up to date and has less security risks. I can even...like read the thing before I run it rather than giving a LLM access to my shell directly. Also anecdotally, it seems more token efficient for those who care about that.

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rolosa • today at 11:17 AM

He says to follow his social, and he provides his handle, but there's no link, and I have no idea how to read it.

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Handy-Man • today at 2:02 PM

That's not official extension though? Misleading title

mindracer • today at 8:18 AM

The extension has over 27 million installs, ouch

blondie9x • today at 1:03 PM

From https://doublepulsar.com/anthropic-hacked-to-deliver-remote-...

Notable customers who run Claude Code and Cursor on laptops include Binance, amongst thousands of others.

Did the Claude Code plugin hack cause the Binance theft? The timing seems like an incredible coincidence.

DEADF007 • today at 1:10 PM

I don't care anymore, how are you supposed to defend yourself against attacks like this? Come and hack me.

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K0nserv • today at 11:47 AM

If the sole purpose of this hack was to steal cryptocurrency, a silver lining might be, as in many similar cases, that if you stay away from that particular dumpster fire you are probably okay. I mean there's still a reverse shell on your machine to fix, but at least nothing of value was lost.

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rvz • today at 12:45 PM

This is embarrassing to Anthropic given here that they lack basic security procedures to prevent this and they have gotten themselves hacked to push malware.

Claude Code was already malware, but with this attack you cannot trust the vendor either.

In the next 2 weeks, no one should download / install / update anything as I predict at least one developer's key for a GitHub, NPM, Crates.io or any other CI or login was leaked and the attacker will target those services to propagate their trojan to more victims.

rhedak • today at 3:01 PM

Honestly with AI getting smarter it feels like these kind of attacks will only increase...

acedTrex • today at 2:16 PM

Thankfully coding is solved everyone

villgax • today at 1:32 PM

What I dont understand is why the hell do these extensions & clis need to update every damn day. clearly there's no new models everyday, what the actual f.

paaloeye • today at 12:51 PM

Another reason for not using VS Code and derived and all their mess of extensions. I'm glad running Claude Code in Ghostty/Terminal is not affected.

jedisct1 • today at 12:20 PM

Keep sending all your secrets and giving full control of your devices to Anthropic.

This is fine.

hem777 • today at 11:25 AM

”I've confirmed Binance use Claude Code with this extension.”

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xteam • today at 12:35 PM

♟

cookiengineer • today at 4:55 PM

It's dangerous to go alone, take this [1]

[1] https://github.com/cookiengineer/check-claude-code-exfil

stopsayingsorry • today at 11:46 AM

Imagine backdooring 50+ million installs.

Hats off to the hackers.

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try-working • today at 1:13 PM

"Software is solved. Bugs are not yet solved"

felixrieseberg • today at 2:35 PM

Felix from Anthropic here.

We’re working with Cursor on this incident, but it wasn’t a compromise of Anthropic’s systems or employee laptops. A malicious actor used access to Cursor’s marketplace to publish a tampered copy of the Claude Code extension, which we didn’t build or publish. The versions on our official channels are not affected and this only impacts Cursor users.

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throwaway919233 • today at 9:42 PM

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hmokiguess • today at 3:09 PM

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arbor-group • today at 1:58 PM

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ankur_misra • today at 5:27 PM

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primce1 • today at 12:13 PM

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FortHire • today at 2:05 PM

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umowbray • today at 1:48 PM

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soundworlds • today at 8:42 PM

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sirnicolaz • today at 1:17 PM

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ath3nd • today at 10:22 PM

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READ_A_BOOK • today at 11:53 AM

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aidotguru • today at 1:00 PM

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coconut-13 • today at 2:58 PM

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sarmedshafi • today at 2:36 PM

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sick_of_slop • today at 11:48 AM

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nickphx • today at 12:11 PM

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xteam • today at 12:35 PM

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poelzi • today at 12:15 PM

I guess, this is why I'm building tix.im ...

ricky_risky • today at 3:20 PM

not just anthropic, my product that used antigravity is also leaked and copied by google, these close ai company will undoubtably steal your code, file and data.

strongly suggest put your valuable work on local llm.