Hi,
sorry but I did not find it:
is there a possibility to receive security announcements for a specific XWiki version via “push” email?
I.E. on the releases topic
https://www.xwiki.org/xwiki/bin/view/Blog/Releases
there is stated for XWiki 15.10.12:
“This release contains security fixes, with the highest severity being 9.1/10”
So that one can decide if an upgrade is urgent.
Best regards
sh