The described "attack" would not work, due to not triggering an HTTP request. When an LLM generates text, it does not send requests to URL-looking strings it generates to validate they are real/live. You'd never get your "ping" request.
The LLM responds with rendered markdown, which conceals the actual link. It constructs it in such a way where the link looks like a message or warning from the YouTube platform, or perhaps something like > Message response too large, click [here](malicious-host.net/blabla?video="Secret Unpublished Video")" to download This is an environment where I suspect a majority of creators probably expect that untrusted links l…
and that's why google calls it social engineering. But i still do believe this is a vulnerability. It catches people offguard, and makes social engineering easier.
An attacker controlled link in a place that a user would not expect to be vulnerable (as it is in a "trusted" environment).