CVE-2021-39127: Atlassian Jira

Medium severity, CVSS 5.3. EPSS: 1.3% chance of exploitation in the next 30 days.

Affected versions of Atlassian Jira Server and Data Center allow anonymous remote attackers to the query component JQL endpoint via a Broken Access Control vulnerability (BAC) vulnerability. The affected versions are before version 8.5.10, and from version 8.6.0 before 8.13.1.

Affected products

• Atlassian Jira: before 8.5.10 (fixed in 8.5.10)
• Atlassian Jira Data Center: from 8.6.0, before 8.13.1 (fixed in 8.13.1)
• Atlassian Jira Server: from 8.6.0, before 8.13.1 (fixed in 8.13.1)
• Atlassian Jira Software Data Center: before 8.5.10 (fixed in 8.5.10)

Published 2021-10-21. Last modified 2026-06-17.