Anyone who thinks they can avoid LLM Prompt injection attacks should be asked to use their email and bank accounts with AI browsers like Comet.
A Reddit post with white invisible text can hijack your agent to do what an attacker wants. Even a decade or 2 back, SQL injection attacks used to require a lot of proficiency on the attacker and prevention strategies from a backend engineer. Compare that with the weak security of so called AI agents that can be hijacked with random white text on an email or pdf or reddit comment
There is no silver bullet, but my point is: it's possible to lower the risk. Try out by yourself with a frontier model and an otherwise 'secure' system: the "ignore previous instructions" and co. are not working any more. This is getting quite difficult to confuse a model (and I am the last person to say prompt injection is a solved problem, see my blog).