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CVE-2026-93921— SiYuan through 3.8.4 Access Control Bypass via Dynamic Icon Endpoint

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.

思源笔记（SiYuan）3.8.4 及之前版本在 端点中未能正确执行发布访问控制，导致持有只读令牌的持有者可以访问文档元数据。攻击者可以通过在 端点传入 和特制的 参数，利用模板注入读取受限文档的区块标题、名称、别名以及层级路径。

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-93921

Vulnerability Information
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Vulnerability Title
SiYuan through 3.8.4 Access Control Bypass via Dynamic Icon Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan versions through 3.8.4 fail to enforce publish access control in the getDynamicIcon endpoint, allowing read-only token holders to access document metadata. Attackers can call the endpoint with type=8 and crafted content to read block titles, names, aliases, and hierarchical paths of restricted documents via template injection.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 0 ~ 3.8.4 -

II. Public POCs for CVE-2026-93921

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III. Intelligence Information for CVE-2026-93921

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Patches & Fixes for CVE-2026-93921 (1)

Vendor Advisories for CVE-2026-93921 (2)

Proof of Concept for CVE-2026-93921 (1)

Same Patch Batch · siyuan-note · 2026-09-18 · 4 CVEs total

CVE-2026-93922 8.8 HIGH SiYuan through 3.8.4 Stored XSS via notebook names
CVE-2026-93923 8.8 HIGH SiYuan through 3.8.4 Stored XSS via Heading Style Attribute
CVE-2026-93591 7.6 HIGH SiYuan before 3.8.3 SQL Injection via unescaped tag in graph.go

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-93921

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