CVE-2026-54070
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk23th percentile - higher than 23% of all known CVEs
Summary
A vulnerability in SiYuan before version 3.7.0 allows JavaScript execution in the administrator's context by rendering a Bazaar package README. The flaw stems from an incomplete allowlist of event attributes in the lute sanitizer engine, which passes modern event handlers (e.g., onpointerover, onpointerdown) through.
Risk Assessment
An attacker as a Bazaar package author can gain full control of the administrator's workspace when the administrator views the package in Settings → Marketplace, without requiring package installation.
Recommendation
Immediately update SiYuan to version 3.7.0 or later. Until the update, administrators should avoid browsing packages in Marketplace.
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Original NVD description (English source)
SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, renderPackageREADME in kernel/bazaar/readme.go renders a Bazaar package README from Markdown to HTML with the lute engine and SetSanitize(true). The lute sanitizer is an event-handler blocklist: allowAttr rejects only attribute names present in a fixed eventAttrs map copied from the w3schools legacy handler list. That map omits modern event handlers. onpointerover, onpointerdown, onauxclick, onbeforetoggle, onfocusin, onanimationstart, and ontransitionend are not in the list, so the sanitizer passes them through verbatim on any tag. The frontend assigns the rendered HTML to mdElement.innerHTML in app/src/config/bazaar.ts with no client-side DOMPurify on this path, into a normal element in the main document (no iframe, no sandbox). The kernel sends no Content-Security-Policy, X-Frame-Options, or X-Content-Type-Options header on any response, so an inline handler runs when its event fires. The README is rendered when an Administrator opens a package in Settings → Marketplace, after the one-time marketplace trust consent. Install is not required. Result: a third-party Bazaar package author runs JavaScript in the Administrator's authenticated SiYuan origin when the Administrator views and interacts with the package listing, and gains full control of the workspace. This vulnerability is fixed in 3.7.0.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS