PT-2026-64997 · Siyuan · Siyuan

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CVE-2026-66396

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Published

2026-07-27

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Updated

2026-07-28

CVSS v4.0

9.3

Critical

VectorAV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Name of the Vulnerable Software and Affected Versions SiYuan versions prior to 3.7.2
Description Stored cross-site scripting is possible due to improper escaping of the title-img Individual Attribute List value during the rendering of Gallery and Kanban cover images. This occurs via unescaped style attribute interpolation. Users with editor permissions can inject onload handlers to execute arbitrary code within the Electron renderer, which grants full Node.js access when a victim opens the affected documents.
Recommendations Update to version 3.7.2 or later.

Exploit

Fix

RCE

XSS

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Weakness Enumeration

Related Identifiers

CVE-2026-66396
GHSA-5RXG-WH59-MG34

Affected Products

Siyuan