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

EPSS: 0.011 (61.4th percentile) — read the EPSS interpretation.

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.

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

cve@gitlab.com (Third Party Advisory, x_refsource_MISC, Broken Link)
cve@gitlab.com (x_refsource_CONFIRM, 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.