CVE-2021-26081

Name: CVE-2021-26081
Creator: NVD / NIST
Published: 2021-07-20T04:15:09.683+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.18%

Last modified Jun 17, 2026

CVE-2021-26081 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. REST API in Atlassian Jira Server and Jira Data Center before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1 allows remote attackers to enumerate usernames via a Sensitive Data Exposure vulnerability in the `/rest/api/latest/user/avatar/temporary` endpoint.. EPSS estimates a 1.18% chance of exploitation in the next 30 days.

Description

REST API in Atlassian Jira Server and Jira Data Center before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1 allows remote attackers to enumerate usernames via a Sensitive Data Exposure vulnerability in the `/rest/api/latest/user/avatar/temporary` endpoint.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

1.18%

63.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Atlassian	Data Center	< 8.5.14
Atlassian	Jira	< 8.5.14
Atlassian	Jira Data Center	>= 8.6.0, < 8.13.6
Atlassian	Jira Data Center	>= 8.14.0, < 8.16.1
Atlassian	Jira Server	>= 8.6.0, < 8.13.6
Atlassian	Jira Server	>= 8.14.0, < 8.16.1

References

https://jira.atlassian.com/browse/JRASERVER-72499Patch, Vendor Advisory
https://jira.atlassian.com/browse/JRASERVER-72499Patch, Vendor Advisory

Timeline

Published: Jul 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26081?

How severe is CVE-2021-26081?

CVE-2021-26081 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.18% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26081?

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-2021-26081?

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

Scan your code now

Source: NVD / NIST