CVE-2021-43943: Atlassian Jira Service Management

Medium severity, CVSS 4.8. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Atlassian Jira Service Management: before 4.21.0 (fixed in 4.21.0)

Published 2022-02-24. Last modified 2026-06-17.