CVE-2026-72811Public exploitNetwork attack vector

Cross-notebook read and write via unescaped MATCH query

Published Aug 14, 2026 · Updated Aug 14, 2026

SQL injection in SiYuan before 3.7.4 allows remote attackers to read and write cross-notebook data through backlink search. The backlink query in kernel/model/backlink.go concatenates the keyword and stored block metadata into SQL while leaving single quotes unescaped. Direct exploitation requires anonymous publish access or a RoleReader token; second-order exploitation requires malicious document content in the workspace.

CVSS severity10.0
Critical
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in SiYuan before 3.7.4 allows remote attackers to read and write cross-notebook data through backlink search. The backlink query in kernel/model/backlink.go concatenates the keyword and stored block metadata into SQL while leaving single quotes unescaped. Direct exploitation requires anonymous publish access or a RoleReader token; second-order exploitation requires malicious document content in the workspace.

The record

CVE
CVE-2026-72811
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <3.7.4

Published CVSS scores

10.0VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
9.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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