5.3

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2026-33066

CVE-2026-33066: SiYuan has Stored XSS to RCE via Unsanitized Bazaar README Rendering

SiYuan is a personal knowledge management system. In versions 3.6.0 and below, the backend renderREADME function uses lute.New() without calling SetSanitize(true), allowing raw HTML embedded in Markdown to pass through unmodified. The frontend then assigns the rendered HTML to innerHTML without any additional sanitization. A malicious package author can embed arbitrary JavaScript in their README that executes when a user clicks to view the package details. Because SiYuan's Electron configuration enables nodeIntegration: true with contextIsolation: false, this XSS escalates directly to full Remote Code Execution. The issue was patched in version 3.6.1.

(GitHub Advisory)

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CVE-2026-33066

CVE-2026-33066:

5.3

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/siyuan-note/siyuan/kernel	go	< 0.0.0-20260314111550-b382f50e1880	0.0.0-20260314111550-b382f50e1880

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability exists in the renderPackageREADME function located in kernel/bazaar/readme.go. This function is responsible for converting package README files from Markdown to HTML. The vulnerability stems from the failure to sanitize the input Markdown before conversion. The lute engine, which is used for the conversion, has a sanitization feature that was not enabled. This allows an attacker to craft a malicious README file containing HTML with embedded JavaScript. When a user views the package in SiYuan's Bazaar, the backend renders this malicious README without sanitization. The resulting HTML is then injected into the DOM on the frontend via innerHTML. This triggers the execution of the embedded JavaScript. Because of SiYuan's insecure Electron configuration, which has nodeIntegration set to true and contextIsolation to false, the executed JavaScript has access to Node.js APIs, allowing the attacker to achieve Remote Code Execution on the user's machine. The provided patch addresses the root cause of the vulnerability by enabling the sanitization feature in the lute engine within the renderPackageREADME function.

Vulnerable functions

renderPackageREADME

kernel/bazaar/readme.go

The function `renderPackageREADME` in `kernel/bazaar/readme.go` was responsible for rendering the README files of packages from the Bazaar. It used the `lute` engine to convert Markdown to HTML. However, it failed to enable the sanitization feature of the `lute` engine by calling `SetSanitize(true)`. This omission allowed malicious HTML, including JavaScript payloads, embedded within a package's README to be passed through unsanitized. The unsanitized HTML was then sent to the frontend, which would render it, leading to a stored Cross-Site Scripting (XSS) vulnerability. Due to an insecure Electron configuration (`nodeIntegration: true`), this XSS could be escalated to Remote Code Execution (RCE). The patch fixed this by adding the line `luteEngine.SetSanitize(true)`, which enables HTML sanitization.

Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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