Collectives — security advisory

{
  "id": "f6c517d0f0af74716b20e257550d8b10e0f88d98b37969f3ac5e171fc2f550e8",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-77171",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-77171",
    "summary": "A public shared collective always allowed recipients of the link to create pages.",
    "evidence": "cve:CVE-2026-77171",
    "products": [
      {
        "name": {
          "value": "Collectives",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-77171",
      "aliases": [
        "CVE-2026-77171"
      ],
      "metrics": [
        {
          "cvssV3_0": {
            "version": "3.0",
            "baseScore": 3.5,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N"
          }
        }
      ],
      "affected": [
        {
          "vendor": "Nextcloud",
          "product": "Collectives",
          "versions": [
            {
              "status": "affected",
              "version": "4.0.0",
              "versionType": "semver",
              "lessThanOrEqual": "4.0.0"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-27T16:15:34.770Z",
      "provider": "cve",
      "references": [
        "https://hackerone.com/reports/3533697"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
          "shortName": "hackerone",
          "dateUpdated": "2026-10-27T16:15:34.770Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-77171",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 394456,
  "published_at": "2026-10-27T16:15:34.77+00:00"
}