CVE-2026-66394: critical vulnerability in siyuan-note siyuan
SiYuan before v3.7.3 Stored and Reflected XSS via SVG Sanitizer Bypass
Published · Updated
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.3epss 0.3%
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.
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
Affected products
siyuan-note · siyuanRelated CVEs — siyuan-note siyuan
In the same product, most dangerous first.
CVE-2026-54069CRITICALSiYuan: Unauthenticated Admin API Access via Blanket chrome-extension:// Origin AllowlistEPSS 7.5%CVE-2026-54068MEDIUMSiYuan: Unauthenticated SQLite Data Exfiltration via Template Injection in /api/icon/getDynamicIconEPSS 4.3%CVE-2026-33476HIGHSiYuan has an Unauthenticated Arbitrary File Read via Path TraversalEPSS 3.3%CVE-2026-54066HIGHSiYuan: Path Traversal via Double URL Encoding in /assets/*path (publish mode arbitrary file─read)EPSS 2.2%CVE-2026-69084CRITICALSiYuan before v3.7.3 SQL Injection via searchEmbedBlockEPSS 1.6%CVE-2026-69085CRITICALSiYuan before v3.7.3 SQL Injection via searchDocsEPSS 1.4%