A quick search can yield similar bug and avoid opening duplicates. Take a minute or two to search our issue tracker or our forum for recent bug reports that could match yours, but don't worry if you open a duplicate: a contributor will handle it :)
We know writing an actionable bug report is hard. Do your best and give as much context as possible, but don't worry: other contributors will reach out to you if they need more details.
Investigate and report possible security issues, and help solve them before users are affected. Please don't do this on Framasoft's infrastructure but through installing the projects yourself.