CVE-2026-66394 - SiYuan before v3.7.3 Stored and Reflected XSS via SVG Sanitizer Bypass

CVE-2026-66394 - SiYuan before v3.7.3 Stored and Reflected XSS via SVG Sanitizer Bypass

https://cvefeed.io/rssfeed/latest.atom / Mon, 07/27/2026 - 19:07
CVE ID :CVE-2026-66394
Published : July 27, 2026, 4:18 p.m. | 33 minutes ago
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.
Severity: 9.3 | CRITICAL
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Kenya Education Network CERT(KENET-CERT) is a Cybersecurity Emergency Response Team and Co-ordination Center operated by the National Research and Education Network of Kenya. KENET-CERT coordination center promotes awareness on cybersecurity incidences as well as coordinates and assists member institutions in responding effectively to cyber security threats and incidences. KENET-CERT works closely with Kenya's National CIRT coordination center (CIRT/CC) as a sector CIRT for the academic institutions. KENET promotes use of ICT in Teaching, Learning and Research in Higher Education Institutions in Kenya. KENET aims to interconnect all the Universities, Tertiary and Research Institutions in Kenya by setting up a cost effective and sustainable private network with high speed access to the global Internet. KENET also facilitates electronic communication among students and faculties in member institutions, share learning and teaching resources by collaboration in Research and Development of Educational content.