CVE-2026-40922

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.

CVSS v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.3 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/advisories/GHSA-4663-4mpg-879v	Third Party Advisory
https://github.com/siyuan-note/siyuan/commit/b382f50e1880ed996364509de5a10a72d7409428	Patch
https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4	Release Notes
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8q5w-mmxf-48jg	Exploit Third Party Advisory
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8q5w-mmxf-48jg	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-04-17 01:17

Updated : 2026-06-17 10:45

NVD link : CVE-2026-40922

Mitre link : CVE-2026-40922

CVE.ORG link : CVE-2026-40922

JSON object : View

Products Affected

b3log

siyuan

CWE

CWE-79

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

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