There are a number of ways you can keep up to date with the latest in security incidents here:
1) We post regular blogs here on the Trust & Security Community Page
2) We have a dedicated Security Advisories page where we keep CVEs and other incidents up to date - https://www.atlassian.com/trust/security/advisories
3) Please subscribe to https://my.atlassian.com/email
If you have any other questions - please don't hesitate to reach back out to the Trust team!