Stored Cross-Site Scripting Vulnerability in SiYuan Personal Knowledge Management Software
CVE-2026-23645

5.3MEDIUM

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
16 January 2026

What is CVE-2026-23645?

SiYuan is an open-source personal knowledge management software that prior to version 3.5.4-dev2 contained a vulnerability allowing for Stored Cross-Site Scripting (XSS) through unfiltered SVG file uploads. This exploitable flaw occurs when users can upload and view SVG files from untrusted sources, leading to the execution of arbitrary JavaScript in the context of their authenticated sessions. This security risk has been remedied in the subsequent release.

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Affected Version(s)

siyuan < 3.5.4-dev2

References

https://github.com/siyuan-note/siyuan/security/advisories...
x_refsource_CONFIRM
https://github.com/siyuan-note/siyuan/issues/16844
x_refsource_MISC
https://github.com/siyuan-note/siyuan/commit/11115da3d0de...
x_refsource_MISC

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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