showdoc .m3u8a file upload vulnerability

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 .m3u8a file extensions in the application’s file upload feature. An attacker could exploit this vulnerability to upload malicious files to execute malicious scripts in the user’s browser, steal user cookies, etc.