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starcitizentools/citizen-skin allows stored XSS in user registration date message

Moderate severity GitHub Reviewed Published Jun 11, 2025 in StarCitizenTools/mediawiki-skins-Citizen • Updated Jun 13, 2025

Package

composer starcitizentools/citizen-skin (Composer)

Affected versions

>= 3.3.0, < 3.3.1

Patched versions

3.3.1

Description

Summary

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.

Details

The result of $this->lang->userDate( $timestamp, $this->user ) returns unescaped values, but is inserted as raw HTML by Citizen:
https://github.com/StarCitizenTools/mediawiki-skins-Citizen/blob/072e4365e9084e4b153eac62d3666566c06f5a49/includes/Components/CitizenComponentUserInfo.php#L55-L60

PoC

  1. Go to any page using citizen with the uselang parameter set to x-xss and while being logged in
    Depending on the registration date of the account you're logged in with, various messages can be shown. In my case, it's november:
    image

Impact

This impacts wikis where a group has the editinterface but not the editsitejs user right.

References

@alistair3149 alistair3149 published to StarCitizenTools/mediawiki-skins-Citizen Jun 11, 2025
Published by the National Vulnerability Database Jun 12, 2025
Published to the GitHub Advisory Database Jun 13, 2025
Reviewed Jun 13, 2025
Last updated Jun 13, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(6th percentile)

Weaknesses

CVE ID

CVE-2025-49578

GHSA ID

GHSA-2v3v-3whp-953h

Source code

Credits

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