CVE-2021-39126

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-21 · updated 2026-06-17
Weakness: CWE-352

Description

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: 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; from 8.6.0 before 8.13.1 — fixed in 8.13.1, 8.5.10

How to fix

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

References

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