"On the evening of March 8, we invalidated all authenticated sessions on GitHub.com created prior to 12:03 UTC on March 8 out of an abundance of caution to protect users from an extremely rare, but potentially serious, security vulnerability affecting a very small number of GitHub.com sessions."
"out of an abundance of caution" adds nothing other than the faint smell of a desperate attempt to reassure the reader. The sentence would read much better without it.
I'm all for rich language where it's useful or appropriate (a novel, etc) but in most cases I just want to know what's up.
[0] https://github.blog/2021-03-08-github-security-update-a-bug-...