SiYuan: Mermaid `javascript:` Link Injection Leads to Stored XSS and Electron RCE

SiYuan is an open-source personal knowledge management system. In versions 3.6.3 and below, Mermaid diagrams are rendered with securityLevel set to "loose", and the resulting SVG is injected into the DOM via innerHTML. This allows attacker-controlled javascript: URLs in Mermaid code blocks to survive into the rendered output. On desktop builds using Electron, windows are created with nodeIntegration enabled and contextIsolation disabled, escalating the stored XSS to arbitrary code execution when a victim opens a note containing a malicious Mermaid block and clicks the rendered diagram node. This issue has been fixed in version 3.6.4.

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

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

SiYuan 安全漏洞

SiYuan是SiYuan开源的一个隐私至上的个人知识管理系统。 SiYuan 3.6.3及之前版本存在安全漏洞，该漏洞源于Mermaid图表以宽松安全级别渲染，且生成的SVG通过innerHTML注入DOM，允许攻击者控制的javascript: URL在渲染输出中保留，在桌面Electron构建中可能将存储型跨站脚本升级为任意代码执行。

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