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Vulnerabilities CVE-2026-66394

CVE-2026-66394

Critical
Open
TLP:CLEAR

SiYuan before v3.7.3 Stored and Reflected XSS via SVG Sanitizer Bypass

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Description

SiYuan before v3.7.3 contains stored and reflected cross-site scripting vulnerabilities in SVG sanitization that allows authenticated attackers to execute scripts by bypassing the HTML parser-based cleaner. Attackers can hide script tags within desc, style, or noscript elements which the HTML parser treats as raw text but browsers interpret as executable SVG content when served as image/svg+xml, enabling script execution in the application origin.

Details

CVSS Score
9.3
EPSS Score
0.27%

18.6th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
Confidence
90%
Published
Jul 27, 2026
Last Modified
Jul 28, 2026
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