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I'm impressed Superhuman seems to have handled this so well - lots of big names are fumbling with AI vuln disclosures. Grammarly is not necessarily who I would have bet on to get it right
Are you f*cking kidding me? Grammarly is like the best one!
The primary exfiltration vector for LLMs is making network requests via images with sensitive data as parameters.

As Claude Code increasingly uses browser tools, we may need to move away from .env files to something encrypted, kind of like rails credentials, but without the secret key in the .env

Programming used to prevent this by separating code from data. AI (currently) has no such safeguards.
Reality doesn't have a distinction between "code" and "data"; those are categories of convenience, and don't even have a proper definition (what is code and what is data depends on who's asking and why). Any such distinction requires mechanically enforcing it; AI won't have it, because it's not natural, and adding it destroys generality of the model.
As limited as they are, LLMs are demonstrably smarter than a whole lot of people, and the number of people more clever than the best AI is going to dwindle, rapidly, especially in the domain of doing sneaky shit really fast on a computer.

There are countless examples of schemes in stories where codes and cryptography are used to exfiltrate information and evade detection, and these models are trained on every last piece of technical, practical text humanity has produced on the subject. All they have to do is contextualize what's likely being done to check and mash together two or three systems it thinks is likely to go under the radar.

“This is good for AI.”
Why does an agent tasked with email summarizing have access to anything else? There’s plenty of difference between an agent and a background service or daemon but it’s at minimum got to be given the same restrictions in scope they would be, or an intern using your system for the same purpose. Developers need to bring the same ZTA mindset to agent permissions they would to building the other services and infrastructure they rely on.
This demonstrates how adding AI features to software such as web browsers dramatically increases the attack surface. It has to be considered potentially malicious and jailed, and hopefully everyone remembers to respect that jail and put up guardrails. Given our history of chroots and jails and containers and virtualization, we know escapes are going to happen. Reminds me of Word and Excel viruses, when scripting was added to documents and left on by default.
Personally, I'd expect a product called SuperHuman to scam me in every way possible, although I know it's just a fancy name for a B2B automation company/ mass mail service