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CVE-2026-87810— Siyuan before v3.8.2 Information Disclosure via fullTextSearchBlock

Quick assessment

Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan是SiYuan团队开源的一个以隐私为先的个人知识管理系统。 SiYuan 3.8.2之前版本存在信息泄露漏洞，该漏洞源于POST /api/search/fullTextSearchBlock端点从结果中过滤私有块但返回未过滤的匹配计数，可能导致未认证的发布模式读者提交任意搜索词，获知隐藏或未发布文档中是否存在匹配内容，并确定匹配块和页面的数量。

CVSS 5.3 · Medium EPSS 0.34% · P27

Possible ATT&CK Techniques 1 AI

T1214

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.8.2 affected
3.8.2 unaffected
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I. Basic Information for CVE-2026-87810

Vulnerability Information
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Vulnerability Title
Siyuan before v3.8.2 Information Disclosure via fullTextSearchBlock
Source: CVE Program / CVE List V5
Vulnerability 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publish-mode readers can submit arbitrary search terms to learn whether matching content exists in hidden or unpublished documents and determine the number of matching blocks and pages.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一个以隐私为先的个人知识管理系统。 SiYuan 3.8.2之前版本存在信息泄露漏洞，该漏洞源于POST /api/search/fullTextSearchBlock端点从结果中过滤私有块但返回未过滤的匹配计数，可能导致未认证的发布模式读者提交任意搜索词，获知隐藏或未发布文档中是否存在匹配内容，并确定匹配块和页面的数量。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 0 ~ 3.8.2 -

II. Public POCs for CVE-2026-87810

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III. Intelligence Information for CVE-2026-87810

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Vendor Advisories for CVE-2026-87810 (2)

Same Patch Batch · siyuan-note · 2026-09-09 · 9 CVEs total

CVE-2026-87815 8.7 HIGH SiYuan before v3.8.2 Path Traversal via removeRiffDeck
CVE-2026-87807 7.5 HIGH siyuan before v3.8.2 SQL Injection via fullTextSearchBlock
CVE-2026-87814 7.3 HIGH SiYuan before v3.8.2 Stored XSS via Asset Preview
CVE-2026-87811 7.3 HIGH SiYuan before v3.8.2 Stored XSS via notebook template paths
CVE-2026-87813 7.3 HIGH SiYuan before v3.8.2 Stored XSS via unescaped asset filenames
CVE-2026-87812 6.8 MEDIUM SiYuan before v3.8.2 Stored XSS via Bazaar iconURL
CVE-2026-87809 6.5 MEDIUM Siyuan before v3.8.2 Information Disclosure via Export Preview
CVE-2026-87808 4.9 MEDIUM SiYuan before v3.8.2 Read-Only Boundary Bypass via fullTextSearchBlock

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-200