CVE-2021-39126: Atlassian Jira Data Center

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to modify various resources via a Cross-Site Request Forgery (CSRF) vulnerability, following an Information Disclosure vulnerability in the referrer headers which discloses a user's CSRF token. The affected versions are before version 8.5.10, and from version 8.6.0 before 8.13.1.

Affected products

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

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