Provide references for CVE-2021-4072.
Where can I find more information about CVE-2021-4072?
References are available at: https://huntr.dev/bounties/74034253-732a-4251-a0f9-eca5f576c955, https://github.com/elgg/elgg/commit/c30b17bf75256ed3fcc84e2083147cc3951423d0.