CVE-2026-40922

UNKNOWN 0.0

SiYuan: Incomplete sanitization of bazaar README allows stored XSS via iframe srcdoc (incomplete fix for CVE-2026-33066)

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	siyuan-note
Product	siyuan
Published	Apr 16, 2026

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Affected Versions

siyuan-note / siyuan

< 3.6.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8q5w-mmxf-48jg github.com: https://github.com/siyuan-note/siyuan/commit/b382f50e1880ed996364509de5a10a72d7409428 github.com: https://github.com/advisories/GHSA-4663-4mpg-879v github.com: https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4