XSS in Atlassian Application Links

CVE-2018-20239

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.033 (87.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2018-20239?
CVE-2018-20239 is a medium-severity vulnerability in Atlassian Application Links, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2019-04-30.
How severe is CVE-2018-20239?
Medium severity. CVSS v3 base score is 5.4 out of 10.