Path Traversal Vulnerability in SiYuan Kernel by SiYuan
CVE-2026-74798

9.3CRITICAL

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
17 August 2026

What is CVE-2026-74798?

The SiYuan Kernel prior to v3.7.4 is susceptible to a path traversal vulnerability due to inadequate validation of the 'id' parameter in the database_clean MCP tool. This flaw allows an authenticated MCP client to inject path traversal sequences, causing the kernel to read arbitrary files accessible to the process and subsequently delete them. Although mitigations were implemented in the HTTP API handlers, the MCP context remains vulnerable, emphasizing the need for immediate remediation strategies.

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-kernel-path-t...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

alham-rizvi
.