What is CVE-2018-18642?

CVE-2018-18642 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-12-04.

How severe is CVE-2018-18642?

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

XSS in GitLab

CVE-2018-18642

An issue was discovered in GitLab Community and Enterprise Edition before 11.2.7, 11.3.x before 11.3.8, and 11.4.x before 11.4.3. It has XSS.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-12-04 · 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: 0.008 (55.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.2% 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

GitLab

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

gitlab.com/gitlab-org/gitlab-ce/issues/52551 (Exploit, Issue Tracking, Vendor Advisory)
about.gitlab.com/2018/10/29/security-release-gitlab-11-dot-4-dot-3-released/ (Vendor Advisory)

Frequently asked questions

What is CVE-2018-18642?: CVE-2018-18642 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-12-04.
How severe is CVE-2018-18642?: Medium severity. CVSS v3 base score is 6.1 out of 10.