CVE-2020-13338 Cross-site scripting in GitLab

Medium 5.4 Published 2 Oct 2020 Updated 4 Aug 2024

Attackers can inject malicious scripts via reference editing in GitLab, potentially leading to session hijacking or code execution.

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-2020-13338?

CVE-2020-13338 is a medium-severity cross-site scripting vulnerability in Gitlab Gitlab, published on 2 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 versions prior to 12.10.13, 13.0.8, 13.1.2. A stored cross-site scripting vulnerability was discovered when editing references.

Weakness: CWE-79

Which versions are affected by CVE-2020-13338?

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

Package	Affected	Fixed in
`gitlab` Bitnami	From `8.10.0`	`12.10.13, 13.0.8, 13.1.2`

Products include Gitlab Gitlab.

How do I fix CVE-2020-13338?

Upgrade gitlab to a fixed version for your release line: 12.10.13, 13.0.8 or 13.1.2.

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-2020-13338 being exploited?

There is no known exploitation of CVE-2020-13338 in the wild and no public exploit code.

All Gitlab Gitlab vulnerabilities

Sources

Also known as BIT-gitlab-2020-13338, GHSA-2qx5-mv7p-q62v, UBUNTU-CVE-2020-13338.