{"id":"CVE-2026-87810","title":"Siyuan before v3.8.2 Information Disclosure via fullTextSearchBlock","summary":"Siyuan before v3.8.2 contains an information disclosure vulnerability in the POST /api/search/fullTextSearchBlock endpoint that filters private blocks from results but returns unfiltered match counts. Unauthenticated publish-mode readers…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cvssSource":"cna","cwe":["CWE-200"],"vendor":"siyuan-note","product":"siyuan","affected":["siyuan < 3.8.2"],"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-14T13:06:21.485020Z"},"exploitAvailable":true,"published":"2026-09-09","updated":"2026-09-14","sourceUpdated":"2026-09-14T13:06:42.069Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-87810","references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-g45v-hxvm-wccj","label":"GitHub Security Advisory (GHSA-g45v-hxvm-wccj)"},{"url":"https://www.vulncheck.com/advisories/siyuan-before-3.8.2-information-disclosure-via-fulltextsearchblock","label":"VulnCheck Advisory: Siyuan before v3.8.2 Information Disclosure via fullTextSearchBlock"}],"tags":["cve.org","exploit-available"],"epss":0.00205,"epssPercentile":0.10821,"ingestedAt":"2026-09-14T15:23:07.426Z","slug":"CVE-2026-87810","body":"## Overview\n\nSiyuan before v3.8.2 contains an information disclosure vulnerability in the POST /api/search/fullTextSearchBlock endpoint that filters private blocks from results but returns unfiltered match counts. Unauthenticated publish-mode readers can submit arbitrary search terms to learn whether matching content exists in hidden or unpublished documents and determine the number of matching blocks and pages.\n\n## Affected\n\n- `siyuan < 3.8.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}