What is CVE-2020-26406?

CVE-2020-26406 is a medium-severity vulnerability in GitLab. CVSS score: 5.3/10. Published 2020-11-17.

How severe is CVE-2020-26406?

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

Vulnerability in GitLab

CVE-2020-26406

Certain SAST CiConfiguration information could be viewed by unauthorized users in GitLab EE starting with 13.3. This information was exposed through GraphQL to non-members of public projects with repository visibility restricted as well as guest members on private projects. Affected versions are: >=13.3, <13.3.9,>=13.4, <13.4.5,>=13.5, <13.5.2.

Published 2020-11-17 · 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: 0.014 (72.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

GitLab
GitLab Ee — versions >=13.3, <13.3.9, >=13.4, <13.4.5, >=13.5, <13.5.2

References

gitlab.com/gitlab-org/gitlab/-/issues/244921 (Broken Link)
hackerone.com/reports/965602 (Permissions Required, Third Party Advisory)
gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26406.json (Vendor Advisory)

Frequently asked questions

What is CVE-2020-26406?: CVE-2020-26406 is a medium-severity vulnerability in GitLab. CVSS score: 5.3/10. Published 2020-11-17.
How severe is CVE-2020-26406?: Medium severity. CVSS v3 base score is 5.3 out of 10.