Inadequate Security Controls in SiYuan by SiYuan Team
CVE-2026-87808

8.7HIGH

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
9 September 2026

What is CVE-2026-87808?

SiYuan versions prior to 3.8.2 exhibit a vulnerability where the read-only boundary is bypassed via the /api/search/fullTextSearchBlock endpoint. Although an administrator check was introduced, it failed to properly enforce the application's read-only state. This allows authenticated administrators to inject arbitrary SQL queries into the database when the workspace is set to read-only mode, potentially exposing sensitive data. The vulnerability was addressed in version 3.8.2.

Affected Version(s)

siyuan 0 < 3.8.2

siyuan 3.8.2

References

https://github.com/siyuan-note/siyuan/security/advisories...
vendor-advisory
https://github.com/siyuan-note/siyuan/commit/d5e2d0bce0df...
patch
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
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

arbor-s
.