What is CVE-2026-87807?

CVE-2026-87807 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under SQL Injection. CVSS score: 7.5/10. Published 2026-09-09.

How severe is CVE-2026-87807?

High severity. CVSS v3 base score is 7.5 out of 10.

SQL Injection in Siyuan-Note Siyuan

CVE-2026-87807

siyuan versions before v3.8.2 contain an authenticated SQL injection vulnerability in the fullTextSearchBlock endpoint's method=1 query parameter. Attackers can inject UNION SELECT statements to read the entire blocks table, bypassing publish-access controls and exposing all document content and sensitive attributes.

Vulnerability class: SQL Injection

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Siyuan-note Siyuan

Weakness classification (CWE)

CWE-89 — SQL Injection

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-87807?: CVE-2026-87807 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under SQL Injection. CVSS score: 7.5/10. Published 2026-09-09.
How severe is CVE-2026-87807?: High severity. CVSS v3 base score is 7.5 out of 10.