Language: PHP
Label: vulnerable
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
    function getMimeType() {
        if (!isset($this->_mimetype)) {
            // Try to to auto-detect mime type
            $finfo = new finfo(FILEINFO_MIME);
            $this->_mimetype = $finfo->buffer($this->getContents(),
                    FILEINFO_MIME_TYPE);
        }

        return $this->_mimetype;
    }