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5.3
SiYuan versions 3.6.1-3.6.3 allow malicious code to run on users' computers
CVE-2026-40922
Summary
Versions 3.6.1 through 3.6.3 of SiYuan contain a security weakness that could let an attacker inject malicious code into the personal knowledge management system. This could allow them to take control of a user's computer. The issue has been fixed in version 3.6.4.
Original title
SiYuan is an open-source personal knowledge management system. In versions 3.6.1 through 3.6.3, a prior fix for XSS in bazaar README rendering (incomplete fix for CVE-2026-33066) enabled the Lute H...
Original description
SiYuan is an open-source personal knowledge management system. In versions 3.6.1 through 3.6.3, a prior fix for XSS in bazaar README rendering (incomplete fix for CVE-2026-33066) enabled the Lute HTML sanitizer, but the sanitizer does not block iframe tags, and its URL-prefix blocklist does not effectively filter srcdoc attributes which contain raw HTML rather than URLs. A malicious bazaar package author can include an iframe with a srcdoc attribute containing embedded scripts in their README. When other users view the package in SiYuan's marketplace UI, the payload executes in the Electron context with full application privileges, enabling arbitrary code execution on the user's machine. This issue has been fixed in version 3.6.4.
nvd CVSS4.0
5.3
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
Published: 17 Apr 2026 · Updated: 17 Apr 2026 · First seen: 17 Apr 2026