SiYuan-Note

A reflected cross-site scripting (XSS) vulnerability exists in SiYuan desktop applications before version 3.7.2, specifically within the bazaar plugin readme handler, allowing attackers to execute arbitrary code by crafting a malicious 'siyuan://' deep link, which leads to Remote Code Execution (RCE) with full Node.js access due to insecure Electron renderer configuration.

Authenticated attackers can exploit stored and reflected cross-site scripting (XSS) vulnerabilities, identified as CVE-2026-66394, in SiYuan versions prior to v3.7.3 by bypassing the application's SVG sanitization to execute arbitrary scripts within the application's origin, potentially leading to session hijacking and data exfiltration.

A stored Cross-Site Scripting (XSS) vulnerability, CVE-2026-54070, affects SiYuan versions up to 3.6.5, allowing a malicious third-party package author to embed JavaScript in package READMEs via an incomplete HTML sanitizer's blocklist, which executes in an Administrator's authenticated browser session upon viewing and interacting with the crafted README in the Bazaar marketplace, leading to API token theft and potential full workspace control.

SiYuan publish-mode Reader can mutate Conf and SQL index via 8 ungated APIs, leading to configuration changes, denial of service, data corruption, and information disclosure by manipulating cloud sync intervals, graph configurations, SQL block content, and recent-documents lists.