Vulnerability · Published Aug 15, 2026 · Assigned by VulnCheck
CVE-2026-73053SiYuan before v3.7.4 Cross-Site Scripting via unicode2Emoji
Critical 9.0
In plain English
A critical-severity cross-site scripting in siyuan from siyuan-note. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).
Severity (CVSS 3.1)9.0Critical
Exploit odds (30 days)0.5%top 55.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| siyuan-note | siyuan | 0 – before 3.7.4 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
References
- GitHub Security Advisory (GHSA-vx5w-qrvp-mmcq) vendor-advisory
- VulnCheck Advisory: SiYuan before v3.7.4 Cross-Site Scripting via unicode2Emoji third-party-advisory