CVE-2021-39906

MEDIUM 6.1CVE-2021-39906 · Published 05/11/2021 · updated 17/06/2026

In short

CVE-2021-39906 is a MEDIUM (CVSS 6.1) vulnerability affecting gitlab (gitlab).
Chance of exploitation in the next 30 days (EPSS): 60.7%, higher than 99.1% of all vulnerabilities.
Fix: update to 14.2.6, 14.3.4, 14.4.1 or later.

Package	Affected versions	Patched versions
gitlab gitlab	`≥ 13.5.0, < 14.2.6≥ 14.3.0, < 14.3.4≥ 14.4.0, < 14.4.1`	`14.2.614.3.414.4.1`

Description

Improper validation of ipynb files in GitLab CE/EE version 13.5 and above allows an attacker to execute arbitrary JavaScript code on the victim's behalf.

References

gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39906.json · Vendor Advisory
gitlab.com/gitlab-org/gitlab/-/issues/341566 · Broken Link
hackerone.com/reports/1347600 · Permissions Required

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Package

Affected versions

Patched versions

gitlab

≥ 13.5.0, < 14.2.6≥ 14.3.0, < 14.3.4≥ 14.4.0, < 14.4.1

14.2.614.3.414.4.1

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