This High severity Third-Party Dependency vulnerability was introduced in versions 5.4.0, 5.12.0, 5.17.0, 10.0.0 and 10.1.0 of Jira Service Management Data Center and Server.

This Third-Party Dependency vulnerability, with a CVSS Score of 8.3, allows an unauthenticated attacker to expose assets in your environment susceptible to exploitation which has no impact to confidentiality, no impact to integrity, low impact to availability, and requires no user interaction.
 
Note: Jira Service Management version 6.0 has been renamed to Jira Service Management 10.0, learn about it here: https://confluence.atlassian.com/servicemanagement/jira-service-management-10-0-x-release-notes-1387597537.html

Atlassian recommends that Jira Service Management Data Center and Server customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions:

Jira Service Management Data Center and Server 5.4: Upgrade to a release greater than or equal to 5.4.28
Jira Service Management Data Center and Server 5.12: Upgrade to a release greater than or equal to 5.12.15
Jira Service Management Data Center and Server 5.17: Upgrade to a release greater than or equal to 5.17.4
Jira Service Management Data Center and Server 10.1: Upgrade to a release greater than or equal to 10.1.1
See the release notes. You can download the latest version of Jira Service Management Data Center and Server from the download center.

This vulnerability was reported via our Atlassian (Internal) program.