CVE-2021-39896

Severity: low (CVSS 3.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-04 · updated 2026-06-17

Description

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.

Affected products

GitLab: from 8.0.0 before 14.1.7; from 14.2 before 14.2.5; from 14.3 before 14.3.1 — fixed in 14.1.7, 14.2.5, 14.3.1

How to fix

Upgrade to a fixed version: GitLab 14.1.7, 14.2.5, 14.3.1. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39896.json
https://gitlab.com/gitlab-org/gitlab/-/issues/339362
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39896.json
https://gitlab.com/gitlab-org/gitlab/-/issues/339362

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