SQL Injection in Siyuan-Note Siyuan
CVE-2026-72811
SiYuan versions <= v3.7.2 contain a SQL injection vulnerability in the backlink/mention search query (kernel/model/backlink.go), which concatenates stored block metadata (title, name, alias, anchor text) and the client-supplied keyword into a SQL MATCH/search statement while escaping only the double-quote character and not the single quote. A single quote in the client keyword (first-order, reachable by an anonymous or RoleReader user on the publish surface) or in stored document metadata (second-order) breaks out of the string literal. Because the query runs on the main read-write siyuan.db handle via a statement-stacking-capable driver, an attacker can execute arbitrary SQL, enabling cross-notebook read and write. Fixed in v3.7.4.
Vulnerability class: SQL Injection
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.002
Affected products
- Siyuan-Note Siyuan — versions 0, 3.7.4
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-q2vg-7qgx-x5fc (vendor-advisory)
- www.vulncheck.com/advisories/siyuan-before-sql-injection-via-backlink-search (third-party-advisory)
Frequently asked questions
- What is CVE-2026-72811?
- CVE-2026-72811 is a critical-severity vulnerability in Siyuan-Note Siyuan, classified under SQL Injection. CVSS score: 10.0/10. Published 2026-08-14.
- How severe is CVE-2026-72811?
- Critical severity. CVSS v3 base score is 10.0 out of 10.