{"id":"CVE-2026-52850","summary":"Docmost: Broken access control in transclusion lookup API leaks sync-block content across private spaces","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.","aliases":["GHSA-5vhf-cgf2-c9cq"],"modified":"2026-09-26T03:46:04.205349786Z","published":"2026-09-24T18:30:06.702Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52850.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-639","CWE-862"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/docmost/docmost","events":[{"introduced":"0"},{"fixed":"830b5b4d458a1302f42c8b68bff9ff559f6eb342"},{"fixed":"ef04c22aeadfb82103f1e8c13a746d352e68a5f7"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"0.90.1"}]}}],"versions":["v0.90.0","v0.80.1","v0.70.2","v0.70.1","v0.71.1","v0.71.0","v0.70.3","v0.70.0","v0.25.3","v0.25.2","v0.25.1","v0.25.0","v0.25.0-beta.1","v0.24.1","v0.24.0","v0.23.2","v0.23.1","v0.23.0","v0.22.2","v0.22.1","v0.22.0","v0.21.0","v0.20.4","v0.20.3","v0.20.2","v0.20.1","v0.20.0","v0.10.2","v0.10.1","v0.10.0","v0.9.0","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.0","v0.6.2","v0.6.1","v0.6.0","v0.5.0","v0.4.1","v0.4.0","v0.3.1","v0.3.0","v0.2.10","v0.2.9","v0.2.8","v0.2.7","v0.2.5","v0.2.4","0.2.3","v0.2.2","v0.2.1","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52850.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"}]}