CVE-2025-49578 Citizen allows stored XSS in user registration date message

Medium 6.5 Published 12 Jun 2025 Updated 12 Jun 2025

Stored XSS in Citizen MediaWiki skin allows attackers with editinterface rights to inject arbitrary HTML into user registration date messages.

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

What is CVE-2025-49578?

CVE-2025-49578 is a medium-severity cross-site scripting vulnerability in StarCitizenTools mediawiki-skins-Citizen, published on 12 Jun 2025. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

Citizen is a MediaWiki skin that makes extensions part of the cohesive experience. Various date messages returned by `Language::userDate` are inserted into raw HTML, allowing anybody who can edit those messages to insert arbitrary HTML into the DOM. This impacts wikis where a group has the `editinterface` but not the `editsitejs` user right. This vulnerability is fixed in 3.3.1.

Weakness: CWE-79

Which versions are affected by CVE-2025-49578?

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 `3.3.0`	`3.3.1`
`starcitizentools/citizen-skin` Packagist	From `3.3.0`	`3.3.1`

Products include Starcitizen.tools Citizen.

How do I fix CVE-2025-49578?

Upgrade starcitizentools/citizen-skin to 3.3.1 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-2025-49578 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-49578 exists.

Sources

Also known as GHSA-2v3v-3whp-953h.