CVE-2020-13321 Cross-site scripting in GitLab
Attackers can inject HTML tags into usernames due to insufficient validation, potentially leading to cross-site scripting attacks in GitLab.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-13321?
CVE-2020-13321 is a high-severity cross-site scripting vulnerability in Gitlab Gitlab, published on 29 Sep 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was discovered in GitLab versions prior to 13.1. Username format restrictions could be bypassed allowing for html tags to be added.
Which versions are affected by CVE-2020-13321?
1 open source package ship an affected version, including gitlab. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
gitlab Bitnami | All versions | 12.10.13, 13.0.8, 13.1.2 |
Products include Gitlab Gitlab.
How do I fix CVE-2020-13321?
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-2020-13321 being exploited?
There is no known exploitation of CVE-2020-13321 in the wild and no public exploit code.
Other vulnerabilities in Gitlab Gitlab
- CVE-2026-97229 GitLab Community Edition and Enterprise Edition Integer Overflow or Wraparound
- CVE-2026-85706 GitLab Community Edition and Enterprise Edition Path Traversal
- CVE-2023-7028 GitLab Community and Enterprise Editions Improper Access Control
- CVE-2021-22205 GitLab Community and Enterprise Editions Remote Code Execution
- CVE-2021-39935 GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF)
Sources
Also known as BIT-gitlab-2020-13321, GHSA-wh94-79gr-cv69, UBUNTU-CVE-2020-13321.