In MediaWiki through 1.37, the Special:ImportFile URI (aka FileImporter) allows XSS, as demonstrated by the clientUrl parameter.Referenceshttps://phabricator.wikimedia.org/T296605https://gerrit.wikimedia.org/r/q/Id1c8910aeac5b452fbabeddab70360765518223ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7JNQA53K675TQBBJPZRAG5ZT6XES3IS/
