{"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 \u2014 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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "server", "vendor": "Nextcloud", "versions": [{"lessThanOrEqual": "34.0.0", "status": "affected", "version": "22.0.0", "versionType": "semver"}]}], "source": "support@hackerone.com"}], "cveTags": [], "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 \u2014 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."}], "id": "CVE-2026-77167", "lastModified": "2026-10-27T17:17:02.673", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "support@hackerone.com", "type": "Secondary"}]}, "published": "2026-10-27T17:17:02.673", "references": [{"source": "support@hackerone.com", "url": "https://hackerone.com/reports/3679640"}], "sourceIdentifier": "support@hackerone.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "support@hackerone.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[22.0.0,34.0.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "server", "source": "cna", "vendor": "Nextcloud"}, "product": "server", "vendor": "nextcloud"}], "created": "2026-10-27T17:45:06.456619+00:00", "title": "Denial of Service via Unauthenticated Write to oc_share_external Table", "updated": "2026-10-27T19:00:08.352764+00:00", "vendors": ["nextcloud", "nextcloud$PRODUCT$server"]}