What is CVE-2018-20238?

CVE-2018-20238 is a high-severity vulnerability in Atlassian Crowd, classified under Session Fixation. CVSS score: 8.1/10. Published 2019-02-13.

How severe is CVE-2018-20238?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Atlassian Crowd

CVE-2018-20238

Various rest resources in Atlassian Crowd before version 3.2.7 and from version 3.3.0 before version 3.3.4 allow remote attackers to authenticate using an expired user session via an insufficient session expiration vulnerability.

Published 2019-02-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.015 (74.1th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Atlassian Crowd — versions unspecified, 3.3.0

Weakness classification (CWE)

CWE-384 — Session Fixation

References

jira.atlassian.com/browse/CWD-5361 (Vendor Advisory)
www.securityfocus.com/bid/107036 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-20238?: CVE-2018-20238 is a high-severity vulnerability in Atlassian Crowd, classified under Session Fixation. CVSS score: 8.1/10. Published 2019-02-13.
How severe is CVE-2018-20238?: High severity. CVSS v3 base score is 8.1 out of 10.