---
title: "CVE-2026-72811: SiYuan: SQL injection in backlink/mention search via unescaped stored and client input (publish mode): first-order (client keyword) and second-order (stored document title) breakout on read-write handle"
url: https://erroneo.us/security/cve/CVE-2026-72811/
description: "CVE-2026-72811 (github.com/siyuan-note/siyuan/kernel (Go)): SiYuan versions"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-14
date_modified: 2026-09-03
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-72811"
kev: false
cvss: 9.9
epss: 0.00436
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-72811: SiYuan: SQL injection in backlink/mention search via unescaped stored and client input (publish mode): first-order (client keyword) and second-order (stored document title) breakout on read-write handle

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.4% , percentile 37: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 37% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/siyuan-note/siyuan/kernel (Go) < 0.0.0-20260723004839-1a5b3431d5ab, fixed in 0.0.0-20260723004839-1a5b3431d5ab . Check your lockfile, including transitive dependencies.

## What it is

SiYuan versions

## Affected packages

- Go `github.com/siyuan-note/siyuan/kernel` < 0.0.0-20260723004839-1a5b3431d5ab → fixed: 0.0.0-20260723004839-1a5b3431d5ab

## Affected products (CVE record)

- siyuan-note siyuan: < 3.7.4

## Severity

- VulnCheck CVSS 4.0: 9.9 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N`
- VulnCheck CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N`
- GitHub CVSS 3.1: 10.0 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.44% probability of exploitation activity in the next 30 days; percentile 37.

## Sources

- [GitHub Security Advisory (GHSA-q2vg-7qgx-x5fc)](https://github.com/siyuan-note/siyuan/security/advisories/GHSA-q2vg-7qgx-x5fc)
- [GitHub Advisory GHSA-q2vg-7qgx-x5fc](https://github.com/advisories/GHSA-q2vg-7qgx-x5fc)
- [CVE.org record CVE-2026-72811](https://www.cve.org/CVERecord?id=CVE-2026-72811)
- [NVD entry CVE-2026-72811](https://nvd.nist.gov/vuln/detail/CVE-2026-72811)
- [VulnCheck Advisory: SiYuan before v3.7.4 SQL Injection via backlink search](https://www.vulncheck.com/advisories/siyuan-before-sql-injection-via-backlink-search)
- [github.com](https://github.com/siyuan-note/siyuan/commit/1a5b3431d5ab3036b19c1cc79486fedd6906fb57)

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Source page: https://erroneo.us/security/cve/CVE-2026-72811/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt