webmail/modules/filesystem/edit.php in U-Mail Webmail server 4.91 allows remote attackers to overwrite arbitrary files via an absolute pathname in the path parameter and arbitrary content in the content parameter. NOTE: this can be leveraged for code execution by writing to a file under the web document root.
Improper Input Validation The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.