CVE-2021-39125: Atlassian Data Center

Medium severity, CVSS 5.3. EPSS: 1.9% chance of exploitation in the next 30 days.

Affected versions of Atlassian Jira Server and Data Center allow anonymous remote attackers to discover the usernames of users via an enumeration vulnerability in the password reset page. The affected versions are before version 8.5.10, and from version 8.6.0 before 8.13.1.

Affected products

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

Published 2021-09-14. Last modified 2026-06-17.