What is CVE-2018-18643?

CVE-2018-18643 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-04-25.

How severe is CVE-2018-18643?

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

XSS in GitLab

CVE-2018-18643

GitLab CE & EE 11.2 and later and before 11.5.0-rc12, 11.4.6, and 11.3.10 have Persistent XSS.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-04-25 · 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: 0.012 (66.0th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

GitLab — versions 11.5.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

about.gitlab.com/2018/11/19/critical-security-release-gitlab-11-dot-4-dot-6-rel… (Vendor Advisory)
about.gitlab.com/blog/categories/releases/ (Vendor Advisory)
gitlab.com/gitlab-org/gitlab-ce/issues/53385 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2018-18643?: CVE-2018-18643 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-04-25.
How severe is CVE-2018-18643?: Medium severity. CVSS v3 base score is 6.1 out of 10.