What is CVE-2019-15581?

CVE-2019-15581 is a medium-severity vulnerability in GitLab, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.3/10. Published 2020-01-28.

How severe is CVE-2019-15581?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in GitLab

CVE-2019-15581

An IDOR exists in < 12.3.2, < 12.2.6, and < 12.1.12 for GitLab Community Edition (CE) and Enterprise Edition (EE) that allowed a project owner or maintainer to see the members of any private group via merge request approval rules.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2020-01-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (60.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

GitLab
GitLab Ee — versions before 12.3.2, before 12.2.6, before 12.1.12

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

about.gitlab.com/blog/2019/09/30/security-release-gitlab-12-dot-3-dot-2-release… (Vendor Advisory)
hackerone.com/reports/518995 (Permissions Required)

Frequently asked questions

What is CVE-2019-15581?: CVE-2019-15581 is a medium-severity vulnerability in GitLab, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.3/10. Published 2020-01-28.
How severe is CVE-2019-15581?: Medium severity. CVSS v3 base score is 5.3 out of 10.