---
id: CVE-2026-56397
title: >-
  SiYuan before v3.6.1 fails to sanitize package metadata and README content in
  the Bazaar marketplace, allowing malicious package authors to inject arbitrary
  HTML and JavaScript
summary: >-
  SiYuan before v3.6.1 fails to sanitize package metadata and README content in
  the Bazaar marketplace, allowing malicious package authors to inject arbitrary
  HTML and JavaScript. Attackers can achieve remote code execution on any user
  bro…
severity: critical
cvss: 9.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'
cwe:
  - CWE-79
vendor: SiYuan
product: SiYuan
affected:
  - SiYuan < 3.6.1
published: '2026-06-21'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:17:22.237'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56397'
references:
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v3mg-9v85-fcm7
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/siyuan-remote-code-execution-via-malicious-bazaar-package-metadata-and-readme-2
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v3mg-9v85-fcm7
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56397'
  - url: 'https://github.com/advisories/GHSA-v3mg-9v85-fcm7'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - go
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-06-24T15:35:29.612043Z'
epss: 0.00496
epssPercentile: 0.42367
aliases:
  - GHSA-v3mg-9v85-fcm7
ecosystem: go
ingestedAt: '2026-09-14T19:13:23.465Z'
---

## Overview

SiYuan before v3.6.1 fails to sanitize package metadata and README content in the Bazaar marketplace, allowing malicious package authors to inject arbitrary HTML and JavaScript. Attackers can achieve remote code execution on any user browsing the Bazaar by embedding XSS payloads in package displayName, description, or README fields, exploiting Electron's nodeIntegration setting to execute OS commands.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-56397)

Affected packages:

- `github.com/siyuan-note/siyuan/kernel <= 0.0.0-20260313024916-fd6526133bb3`

Source: https://github.com/advisories/GHSA-v3mg-9v85-fcm7