{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-25623",
        "ASSIGNER": "security-advisories@github.com",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 4.2.7, 4.1.15, 4.0.15, and 3.5.19, when fetching remote statuses, Mastodon doesn't check that the response from the remote server has a `Content-Type` header value of the Activity Streams media type, which allows a threat actor to upload a crafted Activity Streams document to a remote server and make a Mastodon server fetch it, if the remote server accepts arbitrary user uploads. The vulnerability allows a threat actor to impersonate an account on a remote server that satisfies all of the following properties: allows the attacker to register an account; accepts arbitrary user-uploaded documents and places them on the same domain as the ActivityPub actors; and serves user-uploaded document in response to requests with an `Accept` header value of the Activity Streams media type. Versions 4.2.7, 4.1.15, 4.0.15, and 3.5.19 contain a fix for this issue."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-434: Unrestricted Upload of File with Dangerous Type",
                        "cweId": "CWE-434"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "mastodon",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "mastodon",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "=",
                                            "version_value": "< 3.5.19"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": ">= 4.0.0, < 4.0.15"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": ">= 4.1.0, < 4.1.15"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": ">= 4.2.0, < 4.2.7"
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://github.com/mastodon/mastodon/security/advisories/GHSA-jhrq-qvrm-qr36",
                "refsource": "MISC",
                "name": "https://github.com/mastodon/mastodon/security/advisories/GHSA-jhrq-qvrm-qr36"
            },
            {
                "url": "https://github.com/mastodon/mastodon/commit/9fee5e852669e26f970e278021302e1a203fc022",
                "refsource": "MISC",
                "name": "https://github.com/mastodon/mastodon/commit/9fee5e852669e26f970e278021302e1a203fc022"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-jhrq-qvrm-qr36",
        "discovery": "UNKNOWN"
    },
    "impact": {
        "cvss": [
            {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 8.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "LOW",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N",
                "version": "3.1"
            }
        ]
    }
}