{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-77167",
        "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
        "state": "PUBLISHED",
        "assignerShortName": "hackerone",
        "dateReserved": "2026-08-20T15:00:00.606Z",
        "datePublished": "2026-10-27T16:15:34.778Z",
        "dateUpdated": "2026-10-27T16:15:34.778Z"
    },
    "containers": {
        "cna": {
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Abusing the federated share endpoint, an attacker can write arbitrary rows into the oc_share_external database table. These rows persist indefinitely — there is no automatic cleanup mechanism. Three distinct denial-of-service conditions follow from this write primitive, all triggered from the same unauthenticated source and all self-renewing on a 24-hour cycle for as long as the injected rows remain in the database."
                }
            ],
            "affected": [
                {
                    "defaultStatus": "unaffected",
                    "vendor": "Nextcloud",
                    "product": "server",
                    "versions": [
                        {
                            "version": "22.0.0",
                            "status": "affected",
                            "lessThanOrEqual": "34.0.0",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://hackerone.com/reports/3679640"
                }
            ],
            "metrics": [
                {
                    "cvssV3_0": {
                        "version": "3.0",
                        "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH"
                    }
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "type": "CWE",
                            "lang": "en",
                            "cweId": "CWE-400",
                            "description": "CWE-400 Uncontrolled Resource Consumption"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "ncsc_nl",
                    "type": "finder"
                }
            ],
            "providerMetadata": {
                "orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
                "shortName": "hackerone",
                "dateUpdated": "2026-10-27T16:15:34.778Z"
            }
        }
    }
}