{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.90.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "830b5b4d458a1302f42c8b68bff9ff559f6eb342"
            },
            {
              "fixed": "ef04c22aeadfb82103f1e8c13a746d352e68a5f7"
            }
          ],
          "repo": "https://github.com/docmost/docmost",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-5vhf-cgf2-c9cq"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-639",
      "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52850.json"
  },
  "details": "Docmost is open-source collaborative wiki and documentation software. Prior to 0.90.1, an authenticated workspace member who does not belong to a private space can call the transclusion / sync-block lookup API with a known sourcePageId and transclusionId pair because the lookup does not enforce private space membership before resolving the source page. The API can return confidential sync-block content and source page metadata even though the normal page APIs deny access to the same page. This issue is fixed in version 0.90.1.",
  "id": "CVE-2026-52850",
  "modified": "2026-09-26T03:30:23.838667579Z",
  "published": "2026-09-24T18:30:06.702Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/docmost/docmost/releases/tag/v0.90.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52850.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/docmost/docmost/security/advisories/GHSA-5vhf-cgf2-c9cq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52850"
    },
    {
      "type": "FIX",
      "url": "https://github.com/docmost/docmost/commit/830b5b4d458a1302f42c8b68bff9ff559f6eb342"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Docmost: Broken access control in transclusion lookup API leaks sync-block content across private spaces"
}