In Spring Framework versions 5.3.0 - 5.3.18, 5.2.0 - 5.2.20, and older unsupported versions, the patterns for disallowedFields on a DataBinder are case sensitive which means a field is not effectively protected unless it is listed with both…

{
                    "product": "Spring Framework",
                    "vendor": "n/a",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "Spring Framework versions 5.3.0 - 5.3.18, 5.2.0 - 5.2.20, and older unsupported versions"
                        }
                    ]
                }