CVE-2026-73053 — SiYuan before v3.7.4 Cross-Site Scripting via unicode2Emoji

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CRITICAL

SiYuan before v3.7.4 Cross-Site Scripting via unicode2Emoji

Published Aug 15, 2026

9.4

CRITICAL

CVSS 4.0

EPSS 0.52%

Description

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.

Affected products

Vendor Siyuan-Note Product Siyuan Default
unaffected
- Version
  0
  Status
  affected
  Constraints
  <3.7.4
- Version
  3.7.4
  Status
  unaffected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Siyuan-Note

Siyuan

unaffected

Version	Status	Constraints
0	affected	<3.7.4
3.7.4	unaffected	-

Remediation

No remediation recorded yet.

Metrics

0.52% 0.00519

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.00519

Score over time

Aug–Oct 2026

EPSS v5

Percentile over time

EPSS v5

Table of values (2 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 3, 2026	0.52% (0.00519)	42.07th	v5 (v2026.06.15)
Aug 16, 2026	0.28% (0.00284)	20.92th	v5 (v2026.06.15)

Weaknesses (1)

CWE-79

Cross-site Scripting (XSS)

References (2)

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vx5w-qrvp-mmcq
exploitvendor-advisory
https://www.vulncheck.com/advisories/siyuan-before-cross-site-scripting-via-unicode2emoji
third-party-advisory

Link	Providers	Tags
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vx5w-qrvp-mmcq		exploitvendor-advisory
https://www.vulncheck.com/advisories/siyuan-before-cross-site-scripting-via-unicode2emoji		third-party-advisory