What is CVE-2026-101091?

CVE-2026-101091 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under SQL Injection. CVSS score: 7.1/10. Published 2026-09-28.

How severe is CVE-2026-101091?

High severity. CVSS v3 base score is 7.1 out of 10.

SQL Injection in Siyuan-Note Siyuan

CVE-2026-101091

SiYuan versions before v3.8.4 fail to properly validate SQL statements in block query embed blocks executed against siyuan.db. Attackers can craft malicious .sy documents with non-read-only SQL statements that execute automatically during background indexing, rendering, or export operations without authentication.

Vulnerability class: SQL Injection

Published 2026-09-28 · last modified 2026-09-28.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Siyuan-Note Siyuan

Weakness classification (CWE)

CWE-89 — SQL Injection

References

github.com/siyuan-note/siyuan/commit/e8ace0c89182c7ee1a1298ff2a849bb6a83dfdec (patch)
github.com/siyuan-note/siyuan/security/advisories/GHSA-67p9-hm94-xwf3 (vendor-advisory)
www.vulncheck.com/advisories/siyuan-before-3.8.4-sql-injection-via-block-query-… (third-party-advisory)

Frequently asked questions

What is CVE-2026-101091?: CVE-2026-101091 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under SQL Injection. CVSS score: 7.1/10. Published 2026-09-28.
How severe is CVE-2026-101091?: High severity. CVSS v3 base score is 7.1 out of 10.