What is CVE-2020-26417?

CVE-2020-26417 is a medium-severity vulnerability in GitLab, classified under Information Disclosure. CVSS score: 5.3/10. Published 2020-12-11.

How severe is CVE-2020-26417?

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

Information disclosure in GitLab

CVE-2020-26417

Information disclosure via GraphQL in GitLab CE/EE 13.1 and later exposes private group and project membership. This affects versions >=13.6 to <13.6.2, >=13.5 to <13.5.5, and >=13.1 to <13.4.7.

Vulnerability class: Information Disclosure

Published 2020-12-11 · 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: 0.012 (66.3th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: +0.000

Affected products

GitLab
GitLab Ce/ee — versions >=13.6 to <13.6.2, >=13.5 to <13.5.5, >=13.1 to <13.4.7

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

gitlab.com/gitlab-org/gitlab/-/issues/282539 (Broken Link)
gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26417.json (Vendor Advisory)

Frequently asked questions

What is CVE-2020-26417?: CVE-2020-26417 is a medium-severity vulnerability in GitLab, classified under Information Disclosure. CVSS score: 5.3/10. Published 2020-12-11.
How severe is CVE-2020-26417?: Medium severity. CVSS v3 base score is 5.3 out of 10.