Provide references for CVE-2021-3915.
Where can I find more information about CVE-2021-3915?
References are available at: https://huntr.dev/bounties/fcb65f2d-257a-46f4-bac9-f6ded5649079, https://github.com/bookstackapp/bookstack/commit/ae155d67454d6b9f6c93b2bb457aaa4b2eb1a9ed.