Project key enumeration via the /rest/api/latest/projectvalidate/key endpoint - CVE-2021-39121

Affected versions of Atlassian Jira Server and Data Center allow authenticated remote attackers to enumerate the keys of private Jira projects via an Information Disclosure vulnerability in the /rest/api/latest/projectvalidate/key endpoint.

The affected versions are before version 8.5.18, from version 8.6.0 before 8.13.10, and from version 8.14.0 before 8.18.2.

*Affected versions:*

• version < 8.5.18
• 8.6.0 ≤ version < 8.13.10
• 8.14.0 ≤ version < 8.18.2

*Fixed versions:*

• 8.5.18
• 8.13.10
• 8.18.2