CVE-2026-77167

{"id": "CVE-2026-77167", "cveTags": [], "metrics": {"cvssMetricV30": [{"type": "Secondary", "source": "support@hackerone.com", "cvssData": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "support@hackerone.com", "affectedData": [{"vendor": "Nextcloud", "product": "server", "versions": [{"status": "affected", "version": "22.0.0", "versionType": "semver", "lessThanOrEqual": "34.0.0"}], "defaultStatus": "unaffected"}]}], "published": "2026-10-27T17:17:02.673", "references": [{"url": "https://hackerone.com/reports/3679640", "source": "support@hackerone.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "support@hackerone.com", "description": [{"lang": "en", "value": "CWE-400"}]}], "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."}], "lastModified": "2026-10-28T14:47:07.963", "sourceIdentifier": "support@hackerone.com"}