Provide references for CVE-2021-21418.
Where can I find more information about CVE-2021-21418?
References are available at: https://github.com/PrestaShop/ps_emailsubscription/security/advisories/GHSA-vwfx-hh3w-fj99, https://github.com/PrestaShop/ps_emailsubscription/commit/664ffb225e2afb4a32640bbedad667dc6e660b70, https://github.com/PrestaShop/ps_emailsubscription/releases/tag/v2.6.1, https://packagist.org/packages/prestashop/ps_emailsubscription.