A vulnerability was found in DiscuzX up to 3.4-20200818. It has been classified as problematic. Affected is the function shownextstep of the file upload/install/include/installfunction.php. The manipulation of the argument uchidden leads to cross site scripting. It is possible to launch the attack remotely. Upgrading to version 3.4-20210119 is able to address this issue. The name of the patch is 4a9673624f46f7609486778ded9653733020c567. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-258612.
Discuz! DiscuzX through X3.4 has reflected XSS via forum.php?mod=post&action=newthread because data/template/1diyportalview.tpl.php does not restrict the content.
Discuz! DiscuzX X3.4 allows remote attackers to bypass intended access restrictions via the archiver\index.php action parameter.
Discuz! DiscuzX X3.4 has XSS via the include\spacecp\spacecpspace.php appid parameter in a delete action.
Discuz! DiscuzX X3.4 has XSS via the include\spacecp\spacecpupload.php op parameter.
Discuz! DiscuzX X3.4 has XSS via the view parameter to include/space/spacepoll.php, as demonstrated by a mod=space do=poll request to home.php.