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CVE-2026-74904— SiYuan before v3.7.4 Missing Authorization via block API

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团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在授权问题漏洞，该漏洞源于kernel/api/block.go中17个块元数据/内容端点（包括getRefText、checkBlockExist和getBlockBreadcrumb）缺少授权检查，这些处理程序仅通过基本身份验证（model.CheckAuth）保护，缺少发布访问过滤，可能允许匿名发布模式阅读器披露工作区中任意块ID的私有块内容派生文本、结构元数据和存在信息。

CVSS 7.5 · High EPSS 0.36% · P29

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.4 affected
3.7.4 unaffected
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I. Basic Information for CVE-2026-74904

Vulnerability Information
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Vulnerability Title
SiYuan before v3.7.4 Missing Authorization via block API
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before v3.7.4 is missing authorization checks in 17 block metadata/content endpoints in kernel/api/block.go (including getRefText, checkBlockExist, and getBlockBreadcrumb). These handlers are gated only by basic authentication (model.CheckAuth) and lack publish-access filtering, allowing anonymous publish-mode readers to disclose private block content-derived text, structural metadata, and existence information for arbitrary block IDs across the workspace.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在授权问题漏洞，该漏洞源于kernel/api/block.go中17个块元数据/内容端点（包括getRefText、checkBlockExist和getBlockBreadcrumb）缺少授权检查，这些处理程序仅通过基本身份验证（model.CheckAuth）保护，缺少发布访问过滤，可能允许匿名发布模式阅读器披露工作区中任意块ID的私有块内容派生文本、结构元数据和存在信息。
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 ~ 3.7.4 -

II. Public POCs for CVE-2026-74904

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III. Intelligence Information for CVE-2026-74904

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Vendor Advisories for CVE-2026-74904 (2)

Same Patch Batch · siyuan-note · 2026-08-18 · 5 CVEs total

CVE-2026-74902 8.6 HIGH SiYuan before v3.7.4 XSS-to-RCE via malicious filename upload
CVE-2026-74906 7.5 HIGH SiYuan before v3.7.4 Incorrect Authorization via Publish Access
CVE-2026-74905 7.1 HIGH SiYuan before v3.7.4 SSRF via IPv6 Transition Address Bypass
CVE-2026-74903 4.3 MEDIUM SiYuan before v3.7.4 Insufficient Access Control via spinBlockDOM

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-862

V. Comments for CVE-2026-74904

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