What is CVE-2020-13300?

CVE-2020-13300 is a high-severity vulnerability in GitLab, classified under Incorrect Authorization. CVSS score: 8.0/10. Published 2020-09-14.

How severe is CVE-2020-13300?

High severity. CVSS v3 base score is 8.0 out of 10.

Auth bypass in GitLab

CVE-2020-13300

GitLab CE/EE version 13.3 prior to 13.3.4 was vulnerable to an OAuth authorization scope change without user consent in the middle of the authorization flow.

Vulnerability class: Broken Access Control

Published 2020-09-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

GitLab — versions >=13.3, <13.3.4

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

gitlab.com/gitlab-org/gitlab/-/issues/219931 (Broken Link)
hackerone.com/reports/884766 (Permissions Required, Third Party Advisory)
gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13300.json (Vendor Advisory)

Frequently asked questions

What is CVE-2020-13300?: CVE-2020-13300 is a high-severity vulnerability in GitLab, classified under Incorrect Authorization. CVSS score: 8.0/10. Published 2020-09-14.
How severe is CVE-2020-13300?: High severity. CVSS v3 base score is 8.0 out of 10.