Provide references for CVE-2021-3916.
Where can I find more information about CVE-2021-3916?
References are available at: https://huntr.dev/bounties/0be32e6b-7c48-43f0-9cec-433000ad8f64, https://github.com/bookstackapp/bookstack/commit/43830a372fc51a8793199d04a34c3f4ebdfccc7b.