CVE-2021-39887: GitLab

Medium severity, CVSS 5.4. EPSS: 0.9% chance of exploitation in the next 30 days.

A stored Cross-Site Scripting vulnerability in the GitLab Flavored Markdown in GitLab CE/EE version 8.4 and above allowed an attacker to execute arbitrary JavaScript code on the victim's behalf.

Affected products

• GitLab GitLab: from 8.4.0, before 14.1.7 (fixed in 14.1.7); from 14.2, before 14.2.5 (fixed in 14.2.5); from 14.3, before 14.3.1 (fixed in 14.3.1)

Published 2021-10-05. Last modified 2026-06-17.