CVE-2020-4021

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-06-01 · updated 2026-06-17
Weakness: CWE-79

Description

Affected versions are: Before 8.5.5, and from 8.6.0 before 8.8.1 of Atlassian Jira Server and Data Center allow remote attackers to inject arbitrary HTML or JavaScript via a cross site scripting (XSS) vulnerability in the XML export view.

Affected products

Atlassian Jira: before 7.13.16 — fixed in 7.13.16
Atlassian Jira: from 8.0.0 before 8.5.5; from 8.6.0 before 8.8.1 — fixed in 8.5.5, 8.8.1
Atlassian Jira: from 8.0.0 before 8.5.5; from 8.6.0 before 8.8.1 — fixed in 8.5.5, 8.8.1
Atlassian Jira Software Data Center: before 7.13.16 — fixed in 7.13.16

How to fix

Upgrade to a fixed version: Atlassian Jira 7.13.16; Atlassian Jira 8.5.5, 8.8.1; Atlassian Jira 8.5.5, 8.8.1; Atlassian Jira Software Data Center 7.13.16. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2020-4021 or the next vulnerability affects your stack