I'd suggest stop to use the word 'only' as it can be perceive wrongly here.

you can simply say Cursor users were affected. or exclusively.

just a tip from someone who worked tech support in cyber a long time. choice of words can really help change sentiments in these situations.

'only server xyz was affected' vs. 'server xyz was affected' or 'incident was isolated to server xyz' was often difference between shouting and crying customers or people understanding what was really meant.