CVE-2026-87810
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publish-mode readers can submit arbitrary search terms to learn whether matching content exists in hidden or unpublished documents and determine the number of matching blocks and pages.
- Published Sep 9, 2026
- CVSS 6.9 medium
- 0.3% chance of exploitation in the next 30 days (EPSS)
- A fix is available