The CORS Filter in Apache Tomcat 9.0.0.M1 to 9.0.0.M21, 8.5.0 to 8.5.15, 8.0.0.RC1 to 8.0.44 and 7.0.41 to 7.0.78 did not add an HTTP Vary header indicating that the response varies depending on Origin. This permitted client and server side…

{
                    "product": "Apache Tomcat",
                    "vendor": "Apache Software Foundation",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "9.0.0.M1 to 9.0.0.M21"
                        },
                        {
                            "status": "affected",
                            "version": "8.5.0 to 8.5.15"
                        },
                        {
                            "status": "affected",
                            "version": "8.0.0.RC1 to 8.0.44"
                        },
                        {
                            "status": "affected",
                            "version": "7.0.41 to 7.0.78"
                        }
                    ]
                }