What is CVE-2020-10955?

CVE-2020-10955 is a medium-severity vulnerability in GitLab, classified under Missing Authorization. CVSS score: 6.5/10. Published 2020-03-27.

How severe is CVE-2020-10955?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in GitLab

CVE-2020-10955

GitLab EE/CE 11.1 through 12.9 is vulnerable to parameter tampering on an upload feature that allows an unauthorized user to read content available under specific folders.

Vulnerability class: Broken Access Control

Published 2020-03-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.4th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

GitLab
Debian Linux — versions 10.0

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

about.gitlab.com/releases/categories/releases/ (Release Notes, Vendor Advisory)
about.gitlab.com/releases/2020/03/26/security-release-12-dot-9-dot-1-released/ (Release Notes, Vendor Advisory)
www.debian.org/security/2020/dsa-4691 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2020-10955?: CVE-2020-10955 is a medium-severity vulnerability in GitLab, classified under Missing Authorization. CVSS score: 6.5/10. Published 2020-03-27.
How severe is CVE-2020-10955?: Medium severity. CVSS v3 base score is 6.5 out of 10.