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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (38.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-336w-67gx-gx2h (vendor-advisory)
- www.vulncheck.com/advisories/siyuan-before-3.8.2-sql-injection-via-fulltextsear… (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.