Provide references for CVE-2021-21370.
Where can I find more information about CVE-2021-21370?
References are available at: https://packagist.org/packages/typo3/cms-backend, https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x7hc-x7fm-f7qh, https://typo3.org/security/advisory/typo3-core-sa-2021-008.