Path Traversal Vulnerability in SiYuan by SiYuan Note
CVE-2026-77086

9.4CRITICAL

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
21 August 2026

What is CVE-2026-77086?

The SiYuan application, prior to version 3.7.4, contains a vulnerability in its handling of the packageName parameter within the Bazaar install and uninstall endpoints. This security flaw permits authenticated administrators to exploit directory traversal sequences, allowing them to write arbitrary files to any directory or recursively delete directories using crafted packageName values. As a result, attackers with administrative privileges can compromise the file system security of the application.

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-path-t...
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:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

alham-rizvi
.