You've certainly picked a tricky one for your first post, Fedora. This is computer-jargon English and I'm not sure what the author is trying to say.
1. If the mitigation is a side effect of the software, then the preposition should be of.
2.If the mitigation is the cause of a side-effect, then the preposition should be to.
Since I don't know what mitigation means in this context, I have to believe he meant meaning #2 above.
Student or Learner