Cross-site scripting (XSS) vulnerability in contrib/cssgen.php in the
GeSHi, as used in the SyntaxHighlight_GeSHi extension and MediaWiki before
1.23.10, 1.24.x before 1.24.3, and 1.25.x before 1.25.2, allows remote
attackers to inject arbitrary web script or HTML via unspecified vectors.