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

Severity: critical (CVSS 9.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-15 · updated 2026-08-26
Weakness: CWE-79

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

siyuan-note siyuan: before 3.7.4 — fixed in 3.7.4

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.7.4. Check the vendor advisory for mitigations.

References

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

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