CVE-2021-26076

Name: CVE-2021-26076
Creator: NVD / NIST
Published: 2021-04-15T00:15:12.983+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.7/10EPSS 1.23%

Last modified Jun 17, 2026

CVE-2021-26076 is a low-severity vulnerability rated 3.7/10 on the CVSS scale. The jira.editor.user.mode cookie set by the Jira Editor Plugin in Jira Server and Data Center before version 8.5.12, from version 8.6.0 before version 8.13.4, and from version 8.14.0 before version 8.15.0 allows remote anonymous attackers who can perform an attacker in the middle attack to learn which mode a user is editing in due to the cookie not being set with a secure attribute if Jira was configured to use https.. EPSS estimates a 1.23% chance of exploitation in the next 30 days.

Description

The jira.editor.user.mode cookie set by the Jira Editor Plugin in Jira Server and Data Center before version 8.5.12, from version 8.6.0 before version 8.13.4, and from version 8.14.0 before version 8.15.0 allows remote anonymous attackers who can perform an attacker in the middle attack to learn which mode a user is editing in due to the cookie not being set with a secure attribute if Jira was configured to use https.

Metrics

CVSS 3.1

3.7/10

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

EPSS Probability

1.23%

65.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Atlassian	Data Center	< 8.5.12
Atlassian	Jira	< 8.5.12
Atlassian	Jira Data Center	>= 8.6.0, < 8.13.4
Atlassian	Jira Data Center	>= 8.14.0, < 8.15.1
Atlassian	Jira Server	>= 8.6.0, < 8.13.4
Atlassian	Jira Server	>= 8.14.0, < 8.15.1

References

https://jira.atlassian.com/browse/JRASERVER-72252Patch, Vendor Advisory
https://jira.atlassian.com/browse/JRASERVER-72252Patch, Vendor Advisory

Timeline

Published: Apr 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26076?

How severe is CVE-2021-26076?

CVE-2021-26076 has a CVSS score of 3.7/10 (LOW severity). The EPSS model estimates a 1.23% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26076?

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-2021-26076?

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

Scan your code now

Source: NVD / NIST