Magento versions 2.3.5-p1 and earlier, and 2.3.5-p1 and earlier have an observable timing discrepancy vulnerability. Successful exploitation could lead to signature verification bypass.
https://github.com/advisories/GHSA-xgp9-j48h-jjf9
https://github.com/advisories/GHSA-crf2-xm6x-46p6
https://helpx.adobe.com/security/products/magento/apsb20-47.html