What is CVE-2019-18454?

CVE-2019-18454 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-11-26.

How severe is CVE-2019-18454?

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

XSS in GitLab

CVE-2019-18454

An issue was discovered in GitLab Community and Enterprise Edition 10.5 through 12.4 in link validation for RDoc wiki pages feature. It has XSS.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-11-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (52.6th percentile), scored 2026-10-26.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

GitLab

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

about.gitlab.com/blog/categories/releases/ (Release Notes, Vendor Advisory)
about.gitlab.com/blog/2019/10/30/security-release-gitlab-12-dot-4-dot-1-release… (Vendor Advisory)

Frequently asked questions

What is CVE-2019-18454?: CVE-2019-18454 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-11-26.
How severe is CVE-2019-18454?: Medium severity. CVSS v3 base score is 6.1 out of 10.