CVE-2018-20239: Atlassian Application Links

Medium severity, CVSS 5.4. EPSS: 3.3% chance of exploitation in the next 30 days.

Application Links before version 5.0.11, from version 5.1.0 before 5.2.10, from version 5.3.0 before 5.3.6, from version 5.4.0 before 5.4.12, and from version 6.0.0 before 6.0.4 allows remote attackers to inject arbitrary HTML or JavaScript via a cross site scripting (XSS) vulnerability in the applinkStartingUrl parameter. The product is used as a plugin in various Atlassian products where the following are affected: Confluence before version 6.15.2, Crucible before version 4.7.0, Crowd before version 3.4.3, Fisheye before version 4.7.0, Jira before version 7.13.3 and 8.x before 8.1.0.

Affected products

• Atlassian Application Links: before 5.0.11 (fixed in 5.0.11); from 5.1.0, before 5.2.10 (fixed in 5.2.10); from 5.3.0, before 5.3.6 (fixed in 5.3.6); from 5.4.0, before 5.4.12 (fixed in 5.4.12); from 6.0.0, before 6.0.4 (fixed in 6.0.4)
• Atlassian Confluence Data Center: before 6.15.2 (fixed in 6.15.2)
• Atlassian Confluence Server: before 6.15.2 (fixed in 6.15.2)
• Atlassian Crowd: before 3.4.3 (fixed in 3.4.3)
• Atlassian Crucible: before 4.7.0 (fixed in 4.7.0)
• Atlassian Fisheye: before 4.7.0 (fixed in 4.7.0)
• Atlassian Jira Data Center: before 7.13.3 (fixed in 7.13.3); from 8.0.0, before 8.1.0 (fixed in 8.1.0)
• Atlassian Jira Server: before 7.13.3 (fixed in 7.13.3); from 8.0.0, before 8.1.0 (fixed in 8.1.0)

Published 2019-04-30. Last modified 2026-06-17.