It's either a a Career Limiting Event, or a Career Learning event.

In the case of a Learning event, you keep your job, and take the time to make the environment more resilient to this kind of issue.

In the case of a Limiting event, you lose your job, and get hired somewhere else for significantly better pay, and make the new environment more resilient to this kind of issue.

Hopefully the Wikimedia foundation is the former.

Nobody is going to know who did this, so probably not career limiting in any major way.

They'll be fine, recruiters don't look this stuff up and generally background checks only care about illegal shit.