What is CVE-2021-39890?

CVE-2021-39890 is a low-severity vulnerability in GitLab, classified under Improper Authentication. CVSS score: 3.1/10. Published 2021-12-06.

How severe is CVE-2021-39890?

Low severity. CVSS v3 base score is 3.1 out of 10.

Auth bypass in GitLab

CVE-2021-39890

It was possible to bypass 2FA for LDAP users and access some specific pages with Basic Authentication in GitLab 14.1.1 and above.

Vulnerability class: Broken Authentication

Published 2021-12-06 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.011 (63.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

GitLab — versions >=14.3, <14.3.1, >=14.2, <14.2.5, 14.3.0

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

gitlab.com/gitlab-org/gitlab/-/issues/341522 (Third Party Advisory, Broken Link)
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39890.json (Third Party Advisory)

Frequently asked questions

What is CVE-2021-39890?: CVE-2021-39890 is a low-severity vulnerability in GitLab, classified under Improper Authentication. CVSS score: 3.1/10. Published 2021-12-06.
How severe is CVE-2021-39890?: Low severity. CVSS v3 base score is 3.1 out of 10.