showdoc .aspx file upload vulnerability (CNVD-2022-20513)

showdoc is an open source tool for IT teams to share documents online. showdoc versions prior to v2.10.4 contain a file upload vulnerability that stems from the lack of effective detection of .aspx file extensions in the application’s file upload functionality. An attacker could use this vulnerability to upload malicious files to execute malicious scripts in the user’s browser, steal user cookies, etc.