CVE-2020-4024: Atlassian Jira

Medium severity, CVSS 5.4. EPSS: 0.9% chance of exploitation in the next 30 days.

The attachment download resource in Atlassian Jira Server and Data Center before 8.5.5, and from 8.6.0 before 8.8.2, and from 8.9.0 before 8.9.1 allows remote attackers to inject arbitrary HTML or JavaScript via a Cross-Site Scripting (XSS) vulnerability issue attachments with a vnd.wap.xhtml+xml content type.

Affected products

• Atlassian Jira: before 8.5.5 (fixed in 8.5.5)
• Atlassian Jira Data Center: from 8.6.0, before 8.8.2 (fixed in 8.8.2); from 8.9.0, before 8.9.1 (fixed in 8.9.1)
• Atlassian Jira Server: from 8.6.0, before 8.8.2 (fixed in 8.8.2); from 8.9.0, before 8.9.1 (fixed in 8.9.1)
• Atlassian Jira Software Data Center: before 8.5.5 (fixed in 8.5.5)

Published 2020-07-01. Last modified 2026-06-17.