CVE-2021-43943

Name: CVE-2021-43943
Creator: NVD / NIST
Published: 2022-02-24T05:15:09.537+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.42%

Last modified Jun 17, 2026

CVE-2021-43943 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. Affected versions of Atlassian Jira Service Management Server and Data Center allow attackers with administrator privileges to inject arbitrary HTML or JavaScript via a Cross-Site Scripting (XSS) vulnerability in the "Object Schema" field of /secure/admin/InsightDefaultCustomFieldConfig.jspa. The affected versions are before version 4.21.0.. EPSS estimates a 0.42% chance of exploitation in the next 30 days.

Description

Affected versions of Atlassian Jira Service Management Server and Data Center allow attackers with administrator privileges to inject arbitrary HTML or JavaScript via a Cross-Site Scripting (XSS) vulnerability in the "Object Schema" field of /secure/admin/InsightDefaultCustomFieldConfig.jspa. The affected versions are before version 4.21.0.

Metrics

CVSS 3.1

4.8/10

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

EPSS Probability

0.42%

33.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Atlassian	Jira Service Management	< 4.21.0

References

https://jira.atlassian.com/browse/JSDSERVER-10980Issue Tracking, Patch, Vendor Advisory
https://jira.atlassian.com/browse/JSDSERVER-10980Issue Tracking, Patch, Vendor Advisory

Timeline

Published: Feb 24, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43943?

How severe is CVE-2021-43943?

CVE-2021-43943 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.42% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43943?

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-2021-43943?

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

Scan your code now

Source: NVD / NIST