CVE-2026-40922

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.

PUBLISHED Reserved 2026-04-15 | Published 2026-04-16 | Updated 2026-04-20 | Assigner GitHub_M

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

References

github.com/...siyuan/security/advisories/GHSA-8q5w-mmxf-48jg exploit

github.com/...siyuan/security/advisories/GHSA-8q5w-mmxf-48jg

github.com/...ommit/b382f50e1880ed996364509de5a10a72d7409428

github.com/advisories/GHSA-4663-4mpg-879v

github.com/siyuan-note/siyuan/releases/tag/v3.6.4

cve.org (CVE-2026-40922)

nvd.nist.gov (CVE-2026-40922)

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