CVE-2025-53370 Citizen stored XSS vulnerability through short descriptions

High 8.6 Published 3 Jul 2025 Updated 7 Jul 2025

An attacker can inject arbitrary HTML into the DOM via short descriptions in the Citizen MediaWiki skin, potentially executing malicious scripts.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2025-53370?

CVE-2025-53370 is a high-severity cross-site scripting vulnerability in StarCitizenTools mediawiki-skins-Citizen, published on 3 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Citizen is a MediaWiki skin that makes extensions part of the cohesive experience. From versions 1.9.4 to before 3.4.0, short descriptions set via the ShortDescription extension are inserted as raw HTML by the Citizen skin, allowing any user to insert arbitrary HTML into the DOM by editing a page. This issue has been patched in version 3.4.0.

Weakness: CWE-79

Which versions are affected by CVE-2025-53370?

2 open source packages ship an affected version, including starcitizentools/citizen-skin. It affects 1 product.

Package	Affected	Fixed in
`starcitizentools/citizen-skin` Packagist	From `1.9.4`	`3.4.0`
`starcitizentools/citizen-skin` Packagist	From `1.9.4`	`3.4.0`

Products include Starcitizen.tools Citizen.

How do I fix CVE-2025-53370?

Upgrade starcitizentools/citizen-skin to 3.4.0 or later.

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-2025-53370 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-53370 exists.

Sources

Also known as GHSA-prmv-7r8c-794g.