What is CVE-2020-4023?

CVE-2020-4023 is a medium-severity vulnerability in Atlassian Crucible, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-06-01.

How severe is CVE-2020-4023?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Atlassian Crucible

CVE-2020-4023

The review coverage resource in Atlassian Fisheye and Crucible before version 4.8.2 allows remote attackers to inject arbitrary HTML or Javascript via a cross site scripting (XSS) vulnerability through the committerFilter parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-06-01 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.008 (54.0th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Atlassian Crucible — versions unspecified
Atlassian Fisheye — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

jira.atlassian.com/browse/FE-7298 (Vendor Advisory)
jira.atlassian.com/browse/CRUC-8482 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-4023?: CVE-2020-4023 is a medium-severity vulnerability in Atlassian Crucible, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-06-01.
How severe is CVE-2020-4023?: Medium severity. CVSS v3 base score is 5.4 out of 10.