HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-66394 — SiYuan before v3.7.3 contains stored and reflected cross-site scripting vulnerab...

·Source: NIST NVD

Updated:

Executive Summary

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, e

Analysis

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 Score: 8.7. Published: 2026-07-27T16:18:11.947.

Indicators of Compromise (1)

CVE (1)
CVE-2026-66394
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Jul 27, 2026. Verified by: NIST.

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