cvelist/2020/26xxx/CVE-2020-26891.json

{
    "CVE_data_meta": {
        "ASSIGNER": "cve@mitre.org",
        "ID": "CVE-2020-26891",
        "STATE": "PUBLIC"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "n/a",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "n/a"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "n/a"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "AuthRestServlet in Matrix Synapse before 1.21.0 is vulnerable to XSS due to unsafe interpolation of the session GET parameter. This allows a remote attacker to execute an XSS attack on the domain Synapse is hosted on, by supplying the victim user with a malicious URL to the /_matrix/client/r0/auth/*/fallback/web or /_matrix/client/unstable/auth/*/fallback/web Synapse endpoints."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "refsource": "MISC",
                "name": "https://github.com/matrix-org/synapse/pull/8444",
                "url": "https://github.com/matrix-org/synapse/pull/8444"
            },
            {
                "refsource": "MISC",
                "name": "https://matrix.org/blog/2020/10/15/synapse-1-21-2-released-and-security-advisory",
                "url": "https://matrix.org/blog/2020/10/15/synapse-1-21-2-released-and-security-advisory"
            },
            {
                "refsource": "MISC",
                "name": "https://github.com/matrix-org/synapse/releases/tag/v1.21.2",
                "url": "https://github.com/matrix-org/synapse/releases/tag/v1.21.2"
            },
            {
                "refsource": "CONFIRM",
                "name": "https://github.com/matrix-org/synapse/security/advisories/GHSA-3x8c-fmpc-5rmq",
                "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-3x8c-fmpc-5rmq"
            }
        ]
    }
}