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.

Affected: npm: @strapi/strapi

An unrestricted file upload vulnerability in the Add New Assets function of Strapi v4.1.12 allows attackers to execute arbitrary code via a crafted file. After an authenticated attacker uploads a file containing a malicious URL, a victim copies and pastes the malicious URL into a new tab to receive the XSS payload.