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CVE-2026-40922: SiYuan versions 3.6.1-3.6.3 allow malicious code to run on users' computers

CVE-2026-40922 · published 6 months ago

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.

What to do

Update b3log siyuan to version 3.6.4 or later.

Affected software

Vendor	Product	Affected versions
b3log	siyuan	>= 3.6.1, < 3.6.4 `cpe:2.3:a:b3log:siyuan::::::::`

Original advisory text

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.

References

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker partial control

Severity

5.3 Medium

Exploitation

<1% chance of attack within 30 days

Type

CWE-79Cross-site Scripting (XSS)

Timeline

Published17 Apr 2026

Updated4 Nov 2026

First seen17 Apr 2026

Sources

CVE-2026-40922 · NVD

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