Provide references for CVE-2021-27693.
Where can I find more information about CVE-2021-27693?
References are available at: https://github.com/sanluan/PublicCMS/issues/51, https://github.com/sanluan/PublicCMS/commit/0f4c4872914b6a71305e121a7d9a19c07cde0338.