CVE-2021-43943 Cross-site scripting in Jira Service Management Data Center

Medium 4.8 Published 24 Feb 2022 Updated 4 Oct 2024

Administrators can inject arbitrary HTML or JavaScript via the Object Schema field, potentially leading to code execution or security bypass.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-43943?

CVE-2021-43943 is a medium-severity cross-site scripting vulnerability in Atlassian Jira Service Management Data Center, published on 24 Feb 2022. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2021-43943?

It affects 1 product.

Products include Atlassian Jira Service Management.

How do I fix CVE-2021-43943?

No fix has been published for CVE-2021-43943 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-43943 being exploited?

There is no known exploitation of CVE-2021-43943 in the wild and no public exploit code.

Sources

Also known as GHSA-v4f6-rc45-6c46.