{"id":"CVE-2026-77167","state":"PUBLISHED","title":"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 cleanu","description":"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.","publishedAt":"2026-10-27T16:15:34.778Z","updatedAt":"2026-10-27T16:15:34.778Z","severity":{"score":7.5,"label":"High","version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"hackerone"},"assigner":"hackerone","products":["Nextcloud server"],"affected":[{"vendor":"Nextcloud","product":"server","defaultStatus":"unaffected","versions":[{"version":"22.0.0","status":"affected","lessThanOrEqual":"34.0.0","versionType":"semver"}]}],"references":["https://hackerone.com/reports/3679640"],"weaknesses":["CWE-400"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/77xxx/CVE-2026-77167.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77167","state":"PUBLISHED","datePublished":"2026-10-27T16:15:34.778Z","dateUpdated":"2026-10-27T16:15:34.778Z","assignerShortName":"hackerone","assignerOrgId":"36234546-b8fa-4601-9d6f-f4e334aa8ea1","dateReserved":"2026-08-20T15:00:00.606Z"},"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":[{"vendor":"Nextcloud","product":"server","defaultStatus":"unaffected","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":[{"cweId":"CWE-400","type":"CWE","lang":"en","description":"CWE-400 Uncontrolled Resource Consumption"}]}],"providerMetadata":{"shortName":"hackerone","orgId":"36234546-b8fa-4601-9d6f-f4e334aa8ea1","dateUpdated":"2026-10-27T16:15:34.778Z"},"credits":[{"lang":"en","value":"ncsc_nl","type":"finder"}]}}}}