diff --git a/schema/v5.0/CVE_JSON_5.0_schema.json b/schema/v5.0/CVE_JSON_5.0_schema.json
index effc3f63204..f5131dcb674 100644
--- a/schema/v5.0/CVE_JSON_5.0_schema.json
+++ b/schema/v5.0/CVE_JSON_5.0_schema.json
@@ -247,7 +247,8 @@
                                 "minLength": 1,
                                 "maxLength": 4096
                             }
-                        }
+                        },
+                        "additionalProperties": false
                     }
                 },
                 "platforms": {
@@ -288,11 +289,10 @@
                                 "maxProperties": 3
                             },
                             {
-                                "required": ["version", "status", "versionType"],
-                                "oneOf": [
-                                    {"required": ["lessThan"]},
-                                    {"required": ["lessThanOrEqual"]}
-                                ]
+                                "required": ["version", "status", "versionType", "lessThan"]
+                            },
+                            {
+                                "required": ["version", "status", "versionType", "lessThanOrEqual"]
                             }
                         ],
                         "properties": {
@@ -348,7 +348,8 @@
                                     }
                                 }
                             }
-                        }
+                        },
+                        "additionalProperties": false
                     }
                 }
             }
@@ -722,7 +723,8 @@
                         "required": [
                             "type",
                             "value"
-                        ]
+                        ],
+                        "additionalProperties": false
                     }
                 }
             },
@@ -883,7 +885,8 @@
                             "required": [
                                 "lang",
                                 "value"
-                            ]
+                            ],
+                            "additionalProperties": false
                         }
                     },
                     "cvssV3_1": {"$ref": "file:imports/cvss/cvss-v3.1.json"},
@@ -905,13 +908,15 @@
                             },
                             "content": {
                                 "type": "object",
+                                "$comment": "additionalProperties are allowed here, since this construct supports arbitrary JSON.",
                                 "description": "JSON object not covered by another metrics format.",
                                 "minProperties": 1
                             }
-                        }
-                    },
-                    "additionalProperties": false
-                }
+                        },
+                        "additionalProperties": false
+                    }
+                },
+                "additionalProperties": false
             }
         },
         "configurations": {
@@ -1100,10 +1105,12 @@
                                     "minLength": 1,
                                     "maxLength": 2048
                                 }
-                            }
+                            },
+                            "additionalProperties": false
                         }
                     }
-                }
+                },
+                "additionalProperties": false
             }
         },
         "tagExtension": {