Multiple vulnerabilities on Meta4 HR from Cegid

A Cross-Site Scripting Vulnerability has been found on Meta4 HR affecting version 819.001.022 and earlier. The endpoint '/sitetest/english/dumpenv.jsp' is vulnerable to XSS attack by 'lang' query, i.e. '/sitetest/english/dumpenv.jsp?snoop=yes&lang=%27%3Cimg%20src/onerror=alert(1)%3E&params'.