Auth bypass in Gitlab

CVE-2021-39876

In all versions of GitLab CE/EE since version 11.3, the endpoint for auto-completing Assignee discloses the members of private groups.

Vulnerability class: Broken Access Control

EPSS: 0.008 (52.9th percentile) — read the EPSS interpretation.

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.

Affected products

Gitlab — versions >=11.3, <14.1.7, >=14.2, <14.2.5, >=14.3, <14.3.1

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

cve@gitlab.com (Exploit, x_refsource_MISC, Issue Tracking, Vendor Advisory)
cve@gitlab.com (Permissions Required, Third Party Advisory, x_refsource_MISC)
cve@gitlab.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2021-39876?: CVE-2021-39876 is a medium-severity vulnerability in Gitlab, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2022-03-28.
How severe is CVE-2021-39876?: Medium severity. CVSS v3 base score is 4.3 out of 10.