What is CVE-2018-20824?

CVE-2018-20824 is a medium-severity vulnerability in Atlassian Jira, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-05-03.

How severe is CVE-2018-20824?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2018-20824 known to be exploited?

15 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Atlassian Jira

CVE-2018-20824

The WallboardServlet resource in Jira before version 7.13.1 allows remote attackers to inject arbitrary HTML or JavaScript via a cross site scripting (XSS) vulnerability in the cyclePeriod parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-05-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.380 (98.5th percentile), scored 2026-10-01.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.380 · newest: 0.380 · change: 0.000

Affected products

Atlassian Jira — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

jira.atlassian.com/browse/JRASERVER-69238 (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2018-20824?: CVE-2018-20824 is a medium-severity vulnerability in Atlassian Jira, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-05-03.
How severe is CVE-2018-20824?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2018-20824 known to be exploited?: 15 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.