Per : https://confluence.atlassian.com/adminjiraserver/jira-data-center-and-jira-service-management-data-center-security-advisory-2021-07-21-1063571388.html?utm_source=alert-email&utm_medium=email&utm_campaign=Jira%20Data%20Center-advisory_july-2021_EML-10812&jobid=105135348&subid=1521081460
Upgrade Jira Center to version 8.17.0 or higher.
If you cannot upgrade to 8.17.0, then upgrade to 8.5.16 or 8.13.8.
Upgrade Jira Service Management Data Center to version 4.17.0 or higher.
If you cannot upgrade to 4.17.0, then upgrade to 4.5.16 or 4.13.8.
Jira Data Center 8.18.0 is not affected by the security advisory, however we have removed that version as available for download because of a bug. If you are already on Jira Data Center or Jira Server 8.18.0, it is worth trying to set aside some time to upgrade to 8.18.1 which contains the fix for that bug.
Daniel | Atlassian Support
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