CVE-2021-39910 : What You Need to Know

An issue has been discovered in GitLab CE/EE affecting versions starting from 12.6 before 14.3.6, 14.4 before 14.4.4, and 14.5 before 14.5.2. Learn about the impact, technical details, and mitigation steps for this CVE.

Understanding CVE-2021-39910

CVE-2021-39910 is a vulnerability in GitLab. Find out more about the details of this security issue.

What is CVE-2021-39910?

CVE-2021-39910 is an HTML Injection vulnerability in GitLab, specifically through the Swagger UI feature.

The Impact of CVE-2021-39910

This vulnerability has the following impact:

CVSS Base Score: 2.6 (Low)
Attack Complexity: High
Attack Vector: Network
User Interaction: Required
Integrity Impact: Low
Privileges Required: Low

Technical Details of CVE-2021-39910

Get insights into the technical aspects of CVE-2021-39910.

Vulnerability Description

The vulnerability involves HTML Injection through the Swagger UI feature in GitLab.

Affected Systems and Versions

Affected Product: GitLab
Vulnerable Versions:
=12.6, <14.3.6

=14.4, <14.4.4

=14.5, <14.5.2

Exploitation Mechanism

The vulnerability allows attackers to inject HTML code through the Swagger UI, potentially leading to cross-site scripting (XSS) attacks.

Mitigation and Prevention

Learn how to mitigate and prevent this vulnerability.

Immediate Steps to Take

Upgrade GitLab to version 14.3.6, 14.4.4, or 14.5.2 to eliminate the vulnerability.
Disable the Swagger UI feature if not essential for operations.

Long-Term Security Practices

Regularly update GitLab to the latest version to address security issues promptly.
Conduct security audits and code reviews to identify and fix vulnerabilities proactively.

Patching and Updates

Ensure timely patching and updates for GitLab to stay protected from known security risks.