# CVE-2026-87810

## Summary

- **CVE ID:** CVE-2026-87810
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-200
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## Description

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publish-mode readers can submit arbitrary search terms to learn whether matching content exists in hidden or unpublished documents and determine the number of matching blocks and pages.

## Affected Products

- siyuan-note — siyuan (0)
- siyuan-note — siyuan (3.8.2)

## References

- [CNA](https://github.com/siyuan-note/siyuan/security/advisories/GHSA-g45v-hxvm-wccj)
- [CNA](https://www.vulncheck.com/advisories/siyuan-before-3.8.2-information-disclosure-via-fulltextsearchblock)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._