Provide references for CVE-2021-29439.
Where can I find more information about CVE-2021-29439?
References are available at: https://github.com/getgrav/grav-plugin-admin/security/advisories/GHSA-wg37-cf5x-55hq, https://github.com/getgrav/grav-plugin-admin/commit/a220359877fd1281f76ba732e5308e0e3002e4b1.