GHSA-2v3v-3whp-953h starcitizentools/citizen-skin allows stored XSS in user registration date message

• Packagist starcitizentools/citizen-skin: >= 3.3.0, < 3.3.1 → fixed in 3.3.1

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