{
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    "data_type": "CVE",
    "data_format": "MITRE",
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        "ID": "CVE-2024-39274",
        "ASSIGNER": "responsibledisclosure@mattermost.com",
        "STATE": "PUBLIC"
    },
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        "description_data": [
            {
                "lang": "eng",
                "value": "Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to properly validate that\u00a0the channel that comes from the sync message is a shared channel, when shared channels are enabled, which allows a malicious remote to add users to arbitrary teams and channels"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-284: Improper Access Control",
                        "cweId": "CWE-284"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Mattermost",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Mattermost",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "status": "affected",
                                                        "version": "9.9.0"
                                                    },
                                                    {
                                                        "lessThanOrEqual": "9.5.6",
                                                        "status": "affected",
                                                        "version": "9.5.0",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "lessThanOrEqual": "9.7.5",
                                                        "status": "affected",
                                                        "version": "9.7.0",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "lessThanOrEqual": "9.8.1",
                                                        "status": "affected",
                                                        "version": "9.8.0",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "status": "unaffected",
                                                        "version": "9.10.0"
                                                    },
                                                    {
                                                        "status": "unaffected",
                                                        "version": "9.9.1"
                                                    },
                                                    {
                                                        "status": "unaffected",
                                                        "version": "9.5.7"
                                                    },
                                                    {
                                                        "status": "unaffected",
                                                        "version": "9.7.6"
                                                    },
                                                    {
                                                        "status": "unaffected",
                                                        "version": "9.8.2"
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                                                "defaultStatus": "unaffected"
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    "references": {
        "reference_data": [
            {
                "url": "https://mattermost.com/security-updates",
                "refsource": "MISC",
                "name": "https://mattermost.com/security-updates"
            }
        ]
    },
    "generator": {
        "engine": "Vulnogram 0.2.0"
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    "source": {
        "advisory": "MMSA-2024-00342",
        "defect": [
            "https://mattermost.atlassian.net/browse/MM-58250"
        ],
        "discovery": "INTERNAL"
    },
    "solution": [
        {
            "lang": "en",
            "supportingMedia": [
                {
                    "base64": false,
                    "type": "text/html",
                    "value": "<p>Update Mattermost to versions 9.10.0, 9.9.1, 9.5.7, 9.7.6, 9.8.2 or higher.</p>"
                }
            ],
            "value": "Update Mattermost to versions 9.10.0, 9.9.1, 9.5.7, 9.7.6, 9.8.2 or higher."
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    ],
    "credits": [
        {
            "lang": "en",
            "value": "Juho Fors\u00e9n"
        }
    ],
    "impact": {
        "cvss": [
            {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 8.7,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "HIGH",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N",
                "version": "3.1"
            }
        ]
    }
}