{
    "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-39177",
        "STATE": "PUBLIC",
        "TITLE": "User impersonation due to incorrect handling of the login JWT"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Geyser",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "<= 1.4.1-SNAPSHOT"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "GeyserMC"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Versions of Geyser prior to 1.4.2-SNAPSHOT allow anyone that can connect to the server to forge a LoginPacket with manipulated JWT token allowing impersonation as any user. Version 1.4.2-SNAPSHOT contains a patch for the issue. There are no known workarounds aside from upgrading."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-287: Improper Authentication"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858",
                "refsource": "CONFIRM",
                "url": "https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858"
            },
            {
                "name": "https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6",
                "refsource": "MISC",
                "url": "https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6"
            },
            {
                "name": "https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY",
                "refsource": "MISC",
                "url": "https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-h77f-xxx7-4858",
        "discovery": "UNKNOWN"
    }
}