Using API or Controller based versions negative quantity is not adequately validated hence creating incorrect shopping cart and order total.
Adding a back-end verification to check that quantity parameter isn't negative. If so, it is set to 1. Patched in 2.11.0
Without uprading, it's possible to just apply the fixes in the same files it's done for the patch. Or you use javax constraint validation on the quantity parameter.
Input Validation Using bean validation constraint Commits with fixes CVE Details below : Mitre NVD
Found and solved by Yannick Gosset from Aix-Marseille University cybersecurity master program supervised by Yassine Ilmi
{ "nvd_published_at": null, "github_reviewed_at": "2020-04-16T18:16:42Z", "severity": "CRITICAL", "github_reviewed": true, "cwe_ids": [ "CWE-20" ] }