CVE-2021-39126

Name: CVE-2021-39126
Creator: NVD / NIST
Published: 2021-10-21T03:15:07.133+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.70%

Last modified Jun 17, 2026

CVE-2021-39126 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.70% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS Probability

0.70%

48.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Atlassian	Jira Data Center	< 8.5.10
Atlassian	Jira Data Center	>= 8.6.0, < 8.13.1
Atlassian	Jira Server	< 8.5.10
Atlassian	Jira Server	>= 8.6.0, < 8.13.1

References

https://jira.atlassian.com/browse/JRASERVER-71806Issue Tracking, Patch, Vendor Advisory
https://jira.atlassian.com/browse/JRASERVER-71806Issue Tracking, Patch, Vendor Advisory

Timeline

Published: Oct 21, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39126?

How severe is CVE-2021-39126?

CVE-2021-39126 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39126?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39126?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST