What is CVE-2020-13357?

CVE-2020-13357 is a medium-severity vulnerability in GitLab, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2020-12-11.

How severe is CVE-2020-13357?

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

Auth bypass in GitLab

CVE-2020-13357

An issue was discovered in Gitlab CE/EE versions >= 13.1 to <13.4.7, >= 13.5 to <13.5.5, and >= 13.6 to <13.6.2 allowed an unauthorized user to access the user list corresponding to a feature flag in a project.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2020-12-11 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.008 (53.8th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.000

Affected products

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

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

gitlab.com/gitlab-org/gitlab/-/issues/241132 (Broken Link)
hackerone.com/reports/962408 (Press/Media Coverage)
gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13357.json (Vendor Advisory)

Frequently asked questions

What is CVE-2020-13357?: CVE-2020-13357 is a medium-severity vulnerability in GitLab, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2020-12-11.
How severe is CVE-2020-13357?: Medium severity. CVSS v3 base score is 4.3 out of 10.