{"id":"CVE-2026-87809","title":"Siyuan before v3.8.2 fails to apply publish-access filtering to embedded blocks before rendering in the /api/export/preview and /api/lute/copyStdMarkdown endpoints","summary":"Siyuan before v3.8.2 fails to apply publish-access filtering to embedded blocks before rendering in the /api/export/preview and /api/lute/copyStdMarkdown endpoints. Attackers with reader access can retrieve the full rendered content of p…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-639"],"vendor":"siyuan-note","product":"siyuan","affected":["siyuan < 3.8.2"],"published":"2026-09-09","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:33.600","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-87809","references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8wx4-fvqw-f5f8","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/siyuan-before-3.8.2-information-disclosure-via-export-preview","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"epss":0.00209,"epssPercentile":0.11306,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-18T17:08:58.264762Z"},"ingestedAt":"2026-09-13T19:07:50.955Z","slug":"CVE-2026-87809","body":"## Overview\n\nSiyuan before v3.8.2 fails to apply publish-access filtering to embedded blocks before rendering in the /api/export/preview and /api/lute/copyStdMarkdown endpoints. Attackers with reader access can retrieve the full rendered content of private, hidden, or publish-disabled blocks by accessing public documents containing embed queries that select those blocks.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}