An unrestricted file upload vulnerability in the Add New Assets function of Strapi 4.1.12 allows attackers to conduct XSS attacks via a crafted PDF file. NOTE: the project documentation suggests that a user with the Media Library "Create (upload)" permission is supposed to be able to upload PDF files containing JavaScript, and that all files in a public assets folder are accessible to the outside world (unless the filename begins with a dot character). The administrator can choose to allow only image, video, and audio files (i.e., not PDF) if desired.
https://grimthereaperteam.medium.com/strapi-v4-1-12-unrestricted-file-upload-b993bfd07e4e
https://github.com/bypazs/strapi
https://docs.strapi.io/user-docs/users-roles-permissions/configuring-administrator-roles
https://docs.strapi.io/dev-docs/configurations/public-assets