What is CVE-2018-20240?

CVE-2018-20240 is a medium-severity vulnerability in Atlassian Crucible, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2019-02-20.

How severe is CVE-2018-20240?

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

XSS in Atlassian Crucible

CVE-2018-20240

The administrative linker functionality in Atlassian Fisheye and Crucible before version 4.7.0 allows remote attackers to inject arbitrary HTML or JavaScript via a cross site scripting (XSS) vulnerability in the href parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-02-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.8% 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 Crucible
Atlassian Fisheye
Atlassian Fisheye And Crucible — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

jira.atlassian.com/browse/FE-7163 (Vendor Advisory)
www.securityfocus.com/bid/107128 (VDB Entry, Third Party Advisory, vdb-entry)
jira.atlassian.com/browse/CRUC-8381 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-20240?: CVE-2018-20240 is a medium-severity vulnerability in Atlassian Crucible, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2019-02-20.
How severe is CVE-2018-20240?: Medium severity. CVSS v3 base score is 4.8 out of 10.