CVE-2026-87810

Medium

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publish-mode readers can submit arbitrary search terms to learn whether matching content exists in hidden or unpublished documents and determine the number of matching blocks and pages.

SeverityMedium

CVSS5.3

Exploit probability—

ProductSiyuan

PublishedSep 9, 2026

First seenSep 9, 2026

Weakness typeCWE-200Sensitive information exposure

How to fix

Update

siyuan-note siyuan3.8.2 or later

Vendor advisories

github.com/siyuan-note/siyuan/security/advisories/GHSA-g45v-hxvm-wccj

Affected products

Product	Affected versions	Fixed in
siyuan-note siyuan	v < 3.8.2	3.8.2

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