Path Guard Bypass Vulnerability in SiYuan by SiYuan Team
CVE-2026-85580

7.1HIGH

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
4 September 2026

What is CVE-2026-85580?

SiYuan versions before v3.8.2 are vulnerable to a path guard bypass that allows attackers to exploit case-sensitive file name discrepancies on Linux file systems. By manipulating case variants of file paths, such as requesting 'PublishAccess.json', unauthorized parties can gain access to sensitive publish-access configuration settings and metadata, posing a significant security risk.

Affected Version(s)

siyuan 0 < 3.8.2

siyuan 3.8.2

References

https://github.com/siyuan-note/siyuan/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-...
third-party-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.