Arbitrary File Read Vulnerability in SiYuan Personal Knowledge Management System
CVE-2026-23850

7.8HIGH

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
19 January 2026

What is CVE-2026-23850?

SiYuan, a personal knowledge management system, has a vulnerability in its markdown functionality that allows unrestricted server-side HTML rendering. This flaw enables attackers to read arbitrary files on the server, potentially exposing sensitive data. Users of versions before 3.5.4 are particularly at risk, as this version includes fixes that mitigate the issue.

Affected Version(s)

siyuan < 3.5.4

References

https://github.com/siyuan-note/siyuan/security/advisories...
x_refsource_CONFIRM
https://github.com/siyuan-note/siyuan/issues/16860
x_refsource_MISC
https://github.com/siyuan-note/siyuan/commit/b2274baba2e1...
x_refsource_MISC

CVSS V4

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.