What is CVE-2021-39896?

CVE-2021-39896 is a low-severity vulnerability in GitLab. CVSS score: 3.8/10. Published 2021-10-04.

How severe is CVE-2021-39896?

Low severity. CVSS v3 base score is 3.8 out of 10.

Vulnerability in GitLab

CVE-2021-39896

In all versions of GitLab CE/EE since version 8.0, when an admin uses the impersonate feature twice and stops impersonating, the admin may be logged in as the second user they impersonated, which may lead to repudiation issues.

Published 2021-10-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.8 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (47.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

GitLab — versions >=8.0, <14.1.7, >=14.2, <14.2.5, >=14.3, <14.3.1

References

gitlab.com/gitlab-org/gitlab/-/issues/339362 (Broken Link)
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39896.json (Vendor Advisory)

Frequently asked questions

What is CVE-2021-39896?: CVE-2021-39896 is a low-severity vulnerability in GitLab. CVSS score: 3.8/10. Published 2021-10-04.
How severe is CVE-2021-39896?: Low severity. CVSS v3 base score is 3.8 out of 10.