CVE-2021-39906: GitLab

Medium severity, CVSS 6.1. EPSS: 60.7% chance of exploitation in the next 30 days.

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.

Affected products

• GitLab GitLab: from 13.5.0, before 14.2.6 (fixed in 14.2.6); from 14.3.0, before 14.3.4 (fixed in 14.3.4); from 14.4.0, before 14.4.1 (fixed in 14.4.1)

Published 2021-11-05. Last modified 2026-06-17.