Information Disclosure Vulnerability in SiYuan Note by SiYuan
CVE-2026-126266

8.7HIGH

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
13 November 2026

What is CVE-2026-126266?

An information disclosure vulnerability exists in SiYuan Note versions 3.6.0 to 3.8.8. This flaw allows unauthenticated users to bypass document passwords using a regex search in the getDoc method. By sending crafted POST requests to /api/filetree/getDoc with a broad regex, attackers can access sensitive protected content. This poses a serious risk as unauthorized individuals can exploit this vulnerability to read confidential information returned in the unfiltered keywords field.

Affected Version(s)

siyuan 3.6.0 < 3.8.9

siyuan 3.8.9

References

https://github.com/siyuan-note/siyuan/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/siyuan-from-3.6.0-be...
third-party-advisory

CVSS V4

Score:
8.7
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

Credit

rexpository
.