PT-2026-64997 · Siyuan Note · Siyuan

Hypnguyen1209 · CVE-2026-66396 · Published 2026-07-27 · Updated 2026-07-27

NVD

CVSS v3.1

8.4

High

Base vector

AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

SiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute interpolation. Attackers with editor permissions can inject onload handlers that execute arbitrary code in the Electron renderer with full Node.js access when victims open affected documents.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-66396

Affected Products

Siyuan

References · 3

• 🔥 https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-66396 · Security Note
• https://vulncheck.com/advisories/siyuan-before-stored-xss-to-rce-via-title-img-ial · Note