In YzmCMS 5.6, stored XSS exists via the common/static/plugin/ueditor/1.4.3.3/php/controller.php action parameter, which allows remote attackers to upload a swf file. The swf file can be injected with arbitrary web script or HTML.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-23370
Reference (s):
- https://github.com/yzmcms/yzmcms/issues/45