Provide references for CVE-2019-18933.
Where can I find more information about CVE-2019-18933?
References are available at: https://blog.zulip.org/2019/11/21/zulip-2-0-7-security-release/, https://github.com/zulip/zulip/commit/0c2cc41d2e40807baa5ee2c72987ebfb64ea2eb6.