Outline has IDOR in document share creation that allows unauthorized access to private documents across workspaces

{
  "id": "a2e65db816149d1f23f7c8ebe4157c5526f36612ff25469f4594cd5c8024b5a8",
  "url": "https://osv.dev/vulnerability/CVE-2026-41649",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Outline has IDOR in document share creation that allows unauthorized access to private documents across workspaces",
    "summary": "Outline is a service that allows for collaborative documentation. The `shares.create` API endpoint starting in version 0.86.0 and prior to version 1.7.0 has an insecure direct object reference.. When both `collectionId` and `documentId` are provided in the request, the authorization logic only checks access to the collection, completely ignoring the document. This allows an authenticated attacker to generate a valid public share link for any document on the platform, including documents belonging to other workspaces. The full document contents can then be retrieved via the `documents.info` endpoint. Version 1.7.0 contains a patch.",
    "evidence": "osv:CVE-2026-41649",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-41649",
      "aliases": [
        "CVE-2026-41649",
        "GHSA-23jj-rp48-w7q7"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/outline/outline",
              "type": "GIT",
              "events": [
                {
                  "introduced": "5bdabc13a608cd7f4fc897205bab905e957ec918"
                },
                {
                  "fixed": "568b4ac074c67c5c58c75637c3a60b41f5bb1e6b"
                },
                {
                  "fixed": "1b91a295e10f58a1088c54f533773788325ff460"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:getoutline:outline:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.86.0"
                      },
                      {
                        "fixed": "1.7.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1b91a295e10f58a1088c54f533773788325ff460"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "568b4ac074c67c5c58c75637c3a60b41f5bb1e6b"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.7.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.6.1",
            "v1.6.0",
            "v1.5.0",
            "v1.4.0",
            "v1.2.0",
            "v1.2.0-0",
            "v1.1.0",
            "v1.0.1",
            "v1.0.0",
            "v0.87.4",
            "v0.87.2",
            "v0.87.1",
            "v0.87.0",
            "v0.86.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41649.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:43.952318078Z",
      "provider": "osv",
      "references": [
        "https://github.com/outline/outline/releases/tag/v1.7.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41649.json",
        "https://github.com/outline/outline/security/advisories/GHSA-23jj-rp48-w7q7",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-41649",
        "https://github.com/outline/outline/commit/1b91a295e10f58a1088c54f533773788325ff460"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41649.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-41649",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 511735,
  "published_at": "2026-04-28T20:11:28.283+00:00"
}