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Node.js CVE-2026-66396

| EUVDEUVD-2026-49329 CRITICAL
Cross-site Scripting (XSS) (CWE-79)
2026-07-27 disclosure@vulncheck.com GHSA-pwp5-qq97-mcqc
9.3
CVSS 4.0 · Vendor: vulncheck
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Severity by source

Vendor (vulncheck) PRIMARY
9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (vulncheck) · only source for this CVE.

CVSS VectorVendor: vulncheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
P
Scope
X

Lifecycle Timeline

3
Patch available
Jul 27, 2026 - 17:02 EUVD
Analysis Generated
Jul 27, 2026 - 16:32 vuln.today
CVE Published
Jul 27, 2026 - 16:18 cve.org
CRITICAL 9.3

DescriptionCVE.org

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.

AnalysisAI

Stored cross-site scripting (XSS) in SiYuan before v3.7.2 allows remote code execution. Attackers with editor permissions can inject a malicious title-img Individual Attribute List value, which is unescaped when rendering Gallery and Kanban cover images, executing arbitrary JavaScript in the Electron renderer with full Node.js access. This vendor-disclosed vulnerability is not known to be actively exploited, but exploitation is feasible with editor-level access.

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CVE-2026-66396 vulnerability details – vuln.today

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