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Vulnerabilities CVE-2026-66396

CVE-2026-66396

Critical
Open
TLP:CLEAR

SiYuan before v3.7.2 Stored XSS to RCE via title-img IAL

AI Analysis

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Description

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.

Details

CVSS Score
9.3
EPSS Score
0.30%

22th percentile

CVSS Vector
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
Confidence
90%
Published
Jul 27, 2026
Last Modified
Jul 28, 2026
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