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CVE-2026-34453— SiYuan: Broken access control in /api/bookmark/getBookmark allows unauthenticated publish visitors to read password-protected bookmarked content

Quick assessment

Affected
siyuan-note siyuan
Exploitation
Public or AI PoC available; prioritize validation
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开源的一个隐私至上的个人知识管理系统。 SiYuan 3.6.2之前版本存在安全漏洞，该漏洞源于发布服务对书签块的访问控制不当，可能导致未经身份验证的访问者检索受保护文档内容。

CVSS 7.5 · High EPSS 1.23% · P66

Public Exploits 1

Nuclei · 1 CVE-2026-34453.yaml [template]

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-34453

Vulnerability Information
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Vulnerability Title
SiYuan: Broken access control in /api/bookmark/getBookmark allows unauthenticated publish visitors to read password-protected bookmarked content
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan is a personal knowledge management system. Prior to version 3.6.2, the publish service exposes bookmarked blocks from password-protected documents to unauthenticated visitors. In publish/read-only mode, /api/bookmark/getBookmark filters bookmark results by calling FilterBlocksByPublishAccess(nil, ...). Because the filter treats a nil context as authorized, it skips the publish password check and returns bookmarked blocks from documents configured as Protected. As a result, anyone who can access the publish service can retrieve content from protected documents without providing the required password, as long as at least one block in the document is bookmarked. This issue has been patched in version 3.6.2.
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
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan开源的一个隐私至上的个人知识管理系统。 SiYuan 3.6.2之前版本存在安全漏洞，该漏洞源于发布服务对书签块的访问控制不当，可能导致未经身份验证的访问者检索受保护文档内容。
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 < 3.6.2 -

II. Public POCs for CVE-2026-34453

# POC Description Source Link Shenlong Link
1 SiYuan v3.6.2 contains an information disclosure vulnerability caused by improper authorization checks in the publish service's bookmark filtering, letting unauthenticated visitors access bookmarked blocks from password-protected documents, exploit requires access to the publish service. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-34453.yaml POC Details
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Qwen3.6-35B-A3B · 10330 chars
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III. Intelligence Information for CVE-2026-34453

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Vendor Advisories for CVE-2026-34453 (1)

Same Patch Batch · siyuan-note · 2026-03-31 · 5 CVEs total

CVE-2026-34449 9.7 CRITICAL SiYuan: Cross-Origin RCE via Permissive CORS Policy and JavaScript Snippet Injection
CVE-2026-34448 9.1 CRITICAL SiYuan: Stored XSS in Attribute View gallery/kanban cover rendering allows arbitrary comma
CVE-2026-34585 8.6 HIGH SiYuan: Stored XSS in imported .sy.zip content leads to arbitrary command execution
CVE-2026-34605 SiYuan: Reflected XSS via SVG namespace prefix bypass in SanitizeSVG ( getDynamicIcon, una

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-863

V. Comments for CVE-2026-34453

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