Lots of apps like slack and discord will show you an opengraph preview of a website if you post a link. I could of course be wrong but expect you could craft an exploit that just required you to be able to post the link - then it it would render the preview and trigger the problem.
Secondly as a sibling pointed out lots of apps have html ads so if you show a malicious ad it could also trigger. I’m old enough to remember the early google ads which which google made text-only specifically because google said that ads were a possible vector for malware. Oh how the turns have tabled.
Open Graph is a standard for HTML meta tags. Apps like Slack and Discord just make a request to the given URL (locally or in their servers) and read those tags. Then they choose how that information should be displayed. No HTML injection occurs.
Secondly as a sibling pointed out lots of apps have html ads so if you show a malicious ad it could also trigger. I’m old enough to remember the early google ads which which google made text-only specifically because google said that ads were a possible vector for malware. Oh how the turns have tabled.