Not sure why only BPS would show up as having old bugs/security vulnerabilities since Wordfence, iThemes Security, All in one wp security, etc etc etc have all had bugs/security vulnerabilities found and reported at one time or another.
Bugs/security vulnerabilities occur from time to time with any software: BPS, Microsoft, etc etc etc. Nothing to be concerned about and just the norm with all software. The bugs in the links you posted were fixed about a year ago. There is a new bug/security vulnerability that I believe will be officially posted/reported soon that has already been corrected/fixed in BPS .52.5 – see below.
https://www.ads-software.com/plugins/bulletproof-security/changelog/
BugFix|Correction: DB Table Prefix Changer: Only allow entering numbers, lowercase letters and underscores in the Randomly Generated DB Table Prefix Form text box. Special thanks to Sathish from: Cyber Security Works Pvt Ltd for reporting a bug/security vulnerability in the DB Table Prefix Changer tool Form. Notes: You MUST be an Administrator and logged into the site as an Administrator in order to enter/test XSS html testing code in the Randomly Generated DB Table Prefix Form text box. Please do NOT actually try this test if you are using a version of BPS that is below .52.5. BPS .52.5 and above versions will only allow entering numbers, lowercase letters, and underscores for the DB Table Prefix name. If you have a BPS version below .52.5 then entering an invalid DB Table Prefix name will crash your website.
FYI – Your site: jezyk.pila.pl is being accidentally flagged and blocked as a malicious website by my Malwarebytes Anti-Malware Premium computer software. I checked your site and it does not contain anything malicious.