What’s Vulnerable › Vulnerabilities

CVE-2021-39125

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-14 · updated 2026-06-17

Description

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; from 8.6.0 before 8.13.1 — fixed in 8.13.1, 8.5.10
• Atlassian Jira: before 8.5.10 — fixed in 8.5.10
• Atlassian Jira: from 8.6.0 before 8.13.1 — fixed in 8.13.1

How to fix

Upgrade to a fixed version: Atlassian Data Center 8.13.1, 8.5.10; Atlassian Jira 8.5.10; Atlassian Jira 8.13.1. Check the vendor advisory for mitigations.

References

• https://jira.atlassian.com/browse/JRASERVER-72009
• https://jira.atlassian.com/browse/JRASERVER-72009

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