Provide references for CVE-2021-39175.
Where can I find more information about CVE-2021-39175?
References are available at: https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-j748-779h-9697, https://github.com/hedgedoc/hedgedoc/pull/1369, https://github.com/hedgedoc/hedgedoc/pull/1375, https://github.com/hedgedoc/hedgedoc/pull/1513.