Authentication Bypass in SiYuan Product by SiYuan Note
CVE-2026-72804

9.2CRITICAL

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
12 August 2026

What is CVE-2026-72804?

In SiYuan versions prior to v3.7.4, a security flaw exists that allows unauthenticated individuals to access block-level content of password-protected documents. The vulnerability occurs due to inadequate validation in the getGraph and getLocalGraph endpoints, enabling attackers to exploit these endpoints without entering a password. This exposes sensitive document content and the complete reference topology to unauthorized users.

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-authen...
third-party-advisory

CVSS V4

Score:
9.2
Severity:
CRITICAL
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

Credit

Shirshakhtml
.