---
id: CVE-2026-73053
title: >-
  SiYuan versions before v3.7.4 contain a cross-site scripting vulnerability in
  the unicode2Emoji function that fails to sanitize codepoint branch output
summary: >-
  SiYuan versions before v3.7.4 contain a cross-site scripting vulnerability in
  the unicode2Emoji function that fails to sanitize codepoint branch output.
  Attackers can craft document icons with hex-encoded markup that executes in
  the rend…
severity: critical
cvss: 9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H'
cwe:
  - CWE-79
published: '2026-08-15'
updated: '2026-08-15'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73053'
references:
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vx5w-qrvp-mmcq
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/siyuan-before-cross-site-scripting-via-unicode2emoji
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-08-16T13:39:04.516Z'
epss: 0.00284
epssPercentile: 0.21144
---

## Overview

SiYuan versions before v3.7.4 contain a cross-site scripting vulnerability in the unicode2Emoji function that fails to sanitize codepoint branch output. Attackers can craft document icons with hex-encoded markup that executes in the renderer with Node integration enabled, achieving arbitrary code execution on the host system.

## Remediation

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