Remote Code Execution Vulnerability in SiYuan Product by SiYuan
CVE-2026-73041

9.4CRITICAL

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
15 August 2026

What is CVE-2026-73041?

SiYuan versions prior to v3.7.4 are susceptible to a vulnerability that allows attackers to manipulate annotation fields written to disk via the setFileAnnotation endpoint. This lack of proper validation and escaping permits the injection of malicious markup into these fields. Once exploited, the malicious scripts can execute in the PDF renderer with complete Node.js access when an annotated PDF file is opened by the user, potentially allowing for unauthorized actions and data breaches.

Affected Version(s)

siyuan 0 < 3.7.4

siyuan 3.7.4

References

https://github.com/siyuan-note/siyuan/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/siyuan-before-remote...
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Shirshakhtml
.