What is CVE-2020-13266?

CVE-2020-13266 is a medium-severity vulnerability in GitLab, classified under Missing Authorization. CVSS score: 4.3/10. Published 2020-06-09.

How severe is CVE-2020-13266?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in GitLab

CVE-2020-13266

Insecure authorization in Project Deploy Keys in GitLab CE/EE 12.8 and later through 13.0.1 allows users to update permissions of other users' deploy keys under certain conditions

Vulnerability class: Broken Access Control

Published 2020-06-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (44.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

GitLab — versions >=12.8, <12.9.8, >=12.10, <12.10.7, >=13.0, <13.0.1

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

gitlab.com/gitlab-org/gitlab/-/issues/208449 (Broken Link)
gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13266.json (Third Party Advisory)

Frequently asked questions

What is CVE-2020-13266?: CVE-2020-13266 is a medium-severity vulnerability in GitLab, classified under Missing Authorization. CVSS score: 4.3/10. Published 2020-06-09.
How severe is CVE-2020-13266?: Medium severity. CVSS v3 base score is 4.3 out of 10.