{"id":"CVE-2026-52850","state":"PUBLISHED","title":"Docmost: Broken access control in transclusion lookup API leaks sync-block content across private spaces","description":"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.","publishedAt":"2026-09-24T18:30:06.702Z","updatedAt":"2026-09-29T03:08:21.988Z","severity":{"score":4.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["docmost docmost"],"affected":[{"vendor":"docmost","product":"docmost","versions":[{"version":"< 0.90.1","status":"affected"}]}],"references":["https://github.com/docmost/docmost/security/advisories/GHSA-5vhf-cgf2-c9cq","https://github.com/docmost/docmost/commit/830b5b4d458a1302f42c8b68bff9ff559f6eb342","https://github.com/docmost/docmost/releases/tag/v0.90.1"],"weaknesses":["CWE-639","CWE-862"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/52xxx/CVE-2026-52850.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52850","state":"PUBLISHED","datePublished":"2026-09-24T18:30:06.702Z","dateUpdated":"2026-09-29T03:08:21.988Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-08T18:41:27.724Z"},"containers":{"cna":{"title":"Docmost: Broken access control in transclusion lookup API leaks sync-block content across private spaces","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"docmost","product":"docmost","versions":[{"version":"< 0.90.1","status":"affected"}]}],"references":[{"url":"https://github.com/docmost/docmost/security/advisories/GHSA-5vhf-cgf2-c9cq","name":"https://github.com/docmost/docmost/security/advisories/GHSA-5vhf-cgf2-c9cq","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/docmost/docmost/commit/830b5b4d458a1302f42c8b68bff9ff559f6eb342","name":"https://github.com/docmost/docmost/commit/830b5b4d458a1302f42c8b68bff9ff559f6eb342","tags":["x_refsource_MISC"]},{"url":"https://github.com/docmost/docmost/releases/tag/v0.90.1","name":"https://github.com/docmost/docmost/releases/tag/v0.90.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862: Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-24T18:30:06.702Z"},"source":{"advisory":"GHSA-5vhf-cgf2-c9cq","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-29T03:08:11.300076Z","id":"CVE-2026-52850","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-29T03:08:21.988Z"}}]}}}