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CVE-2026-93923— SiYuan through 3.8.4 Stored XSS via Heading Style Attribute

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 及之前版本在渲染大纲和书签面板的 HTML 时，未对标题样式属性进行转义，从而导致存储型跨站脚本（XSS）漏洞。攻击者可以通过提供精心构造的笔记本，或调用管理端点，注入恶意样式值；这些值会在 Electron 渲染进程中执行，并获得对系统的完全访问权限。

CVSS 8.8 · High Updated Sep 19, 2026

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

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Vulnerability Information

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Vulnerability Title

SiYuan through 3.8.4 Stored XSS via Heading Style Attribute

Source: CVE Program / CVE List V5

Vulnerability Description

SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark dock HTML, allowing stored cross-site scripting. Attackers can supply crafted notebooks or call administrative endpoints to inject malicious style values that execute in the Electron renderer with full system access.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

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-2026-93923

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-93923

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Patches & Fixes for CVE-2026-93923 (2)

🔗 siyuan/app/src/util/Tree.ts at v3.8.4 · siyuan-note/siyuan · GitHub technical-description
🔗 siyuan/kernel/model/render.go at v3.8.4 · siyuan-note/siyuan · GitHub Read full article technical-description

Vendor Advisories for CVE-2026-93923 (2)

Proof of Concept for CVE-2026-93923 (1)

🔗 GitHub - siyuan-note/siyuan: An open-source, privacy-first, self-hosted knowledge workspace where humans and AI agents work together 开源、隐私优先、自托管的知识工作空间，让人与智能体在此协作 · GitHub product

https://www.cve.org/CVERecord?id=CVE-2026-93923

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-2026-93591	7.6 HIGH	SiYuan before 3.8.3 SQL Injection via unescaped tag in graph.go
CVE-2026-93921	4.3 MEDIUM	SiYuan through 3.8.4 Access Control Bypass via Dynamic Icon Endpoint

IV. Related Vulnerabilities

Same product: siyuan

Same vendor: siyuan-note

Same weakness: CWE-79

V. Comments for CVE-2026-93923

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-93923— SiYuan through 3.8.4 Stored XSS via Heading Style Attribute

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2026-93923

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-93923

III. Intelligence Information for CVE-2026-93923

Patches & Fixes for CVE-2026-93923 (2)

Vendor Advisories for CVE-2026-93923 (2)

Proof of Concept for CVE-2026-93923 (1)

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

IV. Related Vulnerabilities

V. Comments for CVE-2026-93923

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