What is CVE-2021-39889?

CVE-2021-39889 is a medium-severity vulnerability in Gitlab, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2021-10-05.

How severe is CVE-2021-39889?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Gitlab

CVE-2021-39889

In all versions of GitLab EE since version 14.1, due to an insecure direct object reference vulnerability, an endpoint may reveal the protected branch name to a malicious user who makes a crafted API call with the ID of the protected branch.

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.008 (53.1th 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 >=14.1, <14.1.7, >=14.2, <14.2.5, >=14.3, <14.3.1

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

cve@gitlab.com (x_refsource_MISC, Broken Link)
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-2021-39889?: CVE-2021-39889 is a medium-severity vulnerability in Gitlab, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2021-10-05.
How severe is CVE-2021-39889?: Medium severity. CVSS v3 base score is 4.3 out of 10.