Formstone <=1.4.16 is vulnerable to a Reflected Cross-Site Scripting (XSS) vulnerability caused by improper validation of user supplied input in the upload-target.php and upload-chunked.php files.
CVSS 3.1MEDIUM 6.1·Network·No auth·User interaction·EPSS 0.01277·Published 2021-01-07·Fixed in 1.4.17CWE-79