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CVE-2026-33066 PUBLISHED CVSS 5.300000190734863 MEDIUM

SiYuan is a personal knowledge management system. In versions 3.6.0 and below, the backend renderREADME function uses lute.New() without calling SetSanitize(true), allowing raw HTML embedded in Markdown to pass through unmodified. The frontend then assigns the rendered HTML to innerHTML without any additional sanitization. A malicious package author can embed arbitrary JavaScript in their README that executes when a user clicks to view the package details. Because SiYuan's Electron configuration enables nodeIntegration: true with contextIsolation: false, this XSS escalates directly to full Remote Code Execution. The issue was patched in version 3.6.1.

EPSS 0.21% · 43.8th percentile

Risk Scores

CVSS v4.0
5.300000190734863
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
EPSS Score
0.21%
43.8th percentile

Affected Products

VendorProductVersions
github.comsiyuan-note/siyuan/kernel0, 0
siyuan-notesiyuan*, < 3.6.1
b3logsiyuan0, 0

Timeline

References

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