What is CVE-2023-3399?

CVE-2023-3399 is a high-severity vulnerability in GitLab, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 8.5/10. Published 2023-11-06.

How severe is CVE-2023-3399?

High severity. CVSS v3 base score is 8.5 out of 10.

Vulnerability in GitLab

CVE-2023-3399

An issue has been discovered in GitLab EE affecting all versions starting from 11.6 before 16.3.6, all versions starting from 16.4 before 16.4.2, all versions starting from 16.5 before 16.5.1. It was possible for an unauthorised project or group member to read the CI/CD variables using the custom project templates.

Published 2023-11-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (37.0th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

GitLab — versions 16.4, 11.6, 16.5

Weakness classification (CWE)

CWE-201 — Insertion of Sensitive Information into Sent Data

References

gitlab.com/gitlab-org/gitlab/-/issues/416244 (issue-tracking, Broken Link)
hackerone.com/reports/2021616 (Permissions Required, technical-description, permissions-required, exploit)

Frequently asked questions

What is CVE-2023-3399?: CVE-2023-3399 is a high-severity vulnerability in GitLab, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 8.5/10. Published 2023-11-06.
How severe is CVE-2023-3399?: High severity. CVSS v3 base score is 8.5 out of 10.