Provide references for CVE-2019-11021.
Where can I find more information about CVE-2019-11021?
References are available at: https://www.schlix.com/html/schlix-cms-downloads.html, https://gurelahmet.com/schlix-cms-v2-1-8-7-authenticated-unrestricted-file-upload-to-rce/, https://www.incibe-cert.es/en/early-warning/vulnerabilities/cve-2019-11021, https://vuldb.com/?id.144129, https://www.schlix.com/news/security/cve-2019-11021-for-older-schlix-cms-v2-1-8-7-november-2018.html.