CVE-2020-13339 Cross-site scripting in GitLab

Medium 5.5 Published 8 Oct 2020 Updated 4 Aug 2024

An attacker can execute arbitrary JavaScript in a victim's browser via a malicious SVG file preview in GitLab.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2020-13339?

CVE-2020-13339 is a medium-severity cross-site scripting vulnerability in Gitlab Gitlab, published on 8 Oct 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

An issue has been discovered in GitLab affecting all versions before 13.2.10, 13.3.7 and 13.4.2: XSS in SVG File Preview. Overall impact is limited due to the current user only being impacted.

Weakness: CWE-79

Which versions are affected by CVE-2020-13339?

1 open source package ship an affected version, including gitlab. It affects 1 product.

Package	Affected	Fixed in
`gitlab` Bitnami	From `12.10.0`	`13.2.10, 13.3.7, 13.4.2`

Products include Gitlab Gitlab.

How do I fix CVE-2020-13339?

Upgrade gitlab to a fixed version for your release line: 13.2.10, 13.3.7 or 13.4.2.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2020-13339 being exploited?

There is no known exploitation of CVE-2020-13339 in the wild and no public exploit code.

All Gitlab Gitlab vulnerabilities

Sources

Also known as BIT-gitlab-2020-13339, GHSA-gpgm-9498-hpqf, UBUNTU-CVE-2020-13339.