What is CVE-2020-4018?

CVE-2020-4018 is a high-severity vulnerability in Atlassian Crucible, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2020-06-01.

How severe is CVE-2020-4018?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in Atlassian Crucible

CVE-2020-4018

The setup resources in Atlassian Fisheye and Crucible before version 4.8.1 allows remote attackers to complete the setup process via a cross-site request forgery (CSRF) vulnerability.

Vulnerability class: CSRF (Cross-Site Request Forgery)

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.0th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Atlassian Crucible — versions unspecified
Atlassian Fisheye — versions unspecified

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

jira.atlassian.com/browse/FE-7287 (Vendor Advisory)
jira.atlassian.com/browse/CRUC-8471 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-4018?: CVE-2020-4018 is a high-severity vulnerability in Atlassian Crucible, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2020-06-01.
How severe is CVE-2020-4018?: High severity. CVSS v3 base score is 8.8 out of 10.