What is CVE-2019-8450?

CVE-2019-8450 is a medium-severity vulnerability in Atlassian Jira, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2019-09-11.

How severe is CVE-2019-8450?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Atlassian Jira

CVE-2019-8450

Various templates of the Optimization plugin in Jira before version 7.13.6, and from version 8.0.0 before version 8.4.0 allow remote attackers who have permission to manage custom fields to inject arbitrary HTML or JavaScript via a cross site scripting (XSS) vulnerability in the name of a custom field.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-09-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Atlassian Jira — versions unspecified, 8.0.0, unspecified
Atlassian Jira Server

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

jira.atlassian.com/browse/JRASERVER-69795 (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2019-8450?: CVE-2019-8450 is a medium-severity vulnerability in Atlassian Jira, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2019-09-11.
How severe is CVE-2019-8450?: Medium severity. CVSS v3 base score is 4.8 out of 10.