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CVE-2026-40922

MEDIUM

5.4

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.

CVE Details

CVSS v3.1 Score5.4

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionREQUIRED

Published4/17/2026

Last Modified4/20/2026

Sourcenvd

Honeypot Sightings0

Affected Products

b3log:siyuan

Weaknesses (CWE)

CWE-79

References

https://github.com/advisories/GHSA-4663-4mpg-879v(security-advisories@github.com)

https://github.com/siyuan-note/siyuan/commit/b382f50e1880ed996364509de5a10a72d7409428(security-advisories@github.com)

https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4(security-advisories@github.com)

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8q5w-mmxf-48jg(security-advisories@github.com)

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8q5w-mmxf-48jg(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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