{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2020-16969",
        "ASSIGNER": "secure@microsoft.com",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "<p>An information disclosure vulnerability exists in how Microsoft Exchange validates tokens when handling certain messages. An attacker who successfully exploited the vulnerability could use this to gain further information from a user.</p>\n<p>To exploit the vulnerability, an attacker could include specially crafted OWA messages that could be loaded, without warning or filtering, from the attacker-controlled URL. This callback vector provides an information disclosure tactic used in web beacons and other types of tracking systems.</p>\n<p>The security update corrects the way that Exchange handles these token validations.</p>\n"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "Information Disclosure"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Microsoft",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Microsoft Exchange Server 2019 Cumulative Update 6",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.02.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 17",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2019 Cumulative Update 7",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.02.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 18",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2013 Cumulative Update 23",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.00.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16969",
                "refsource": "MISC",
                "name": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16969"
            }
        ]
    },
    "impact": {
        "cvss": [
            {
                "version": "3.1",
                "baseSeverity": "HIGH",
                "baseScore": 7.1,
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L/E:P/RL:O/RC:C"
            }
        ]
    }
}