Provide references for CVE-2021-35955.
Where can I find more information about CVE-2021-35955?
References are available at: https://contao.org/en/news/contao-4-9-16-and-4-11-5-are-available.html, https://github.com/contao/contao/security/advisories/GHSA-hr3h-x6gq-rqcp.