What is CVE-2019-5471?

CVE-2019-5471 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2019-09-09.

How severe is CVE-2019-5471?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in GitLab

CVE-2019-5471

An input validation and output encoding issue was discovered in the GitLab email notification feature which could result in a persistent XSS. This was addressed in GitLab 12.1.2, 12.0.4, and 11.11.6.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-09-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (56.0th percentile), scored 2026-10-26.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.0% 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
GitLab — versions Fixed versions 12.1.2, 12.0.4, and 11.11.6

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

hackerone.com/reports/496973 (Exploit, Third Party Advisory)
gitlab.com/gitlab-org/gitlab-ee/issues/11515 (Exploit, Vendor Advisory)
about.gitlab.com/2019/07/29/security-release-gitlab-12-dot-1-dot-2-released/ (Broken Link, Vendor Advisory)

Frequently asked questions

What is CVE-2019-5471?: CVE-2019-5471 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2019-09-09.
How severe is CVE-2019-5471?: Medium severity. CVSS v3 base score is 5.4 out of 10.