CVE-2026-93591Public exploitNetwork attack vectorHinoki check available

Private notebook disclosure via unescaped graph tags

Published Sep 18, 2026 · Updated Sep 18, 2026

SQL injection in SiYuan before 3.8.3 allows remote attackers to read private notebook data through the graph endpoint. The graph.go query2Stmt function inserts parsed inline-HTML tag text into SQL LIKE literals without escaping single quotes, allowing a UNION query to cross the publish-access boundary. The endpoint is reachable by publish-mode readers and by anonymous visitors only when publish authentication is disabled; encrypted notebooks are outside the reported impact.

CVSS severity7.6
High
EPSS probability0.32%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SQL injection in SiYuan before 3.8.3 allows remote attackers to read private notebook data through the graph endpoint. The graph.go query2Stmt function inserts parsed inline-HTML tag text into SQL LIKE literals without escaping single quotes, allowing a UNION query to cross the publish-access boundary. The endpoint is reachable by publish-mode readers and by anonymous visitors only when publish authentication is disabled; encrypted notebooks are outside the reported impact.

The record

CVE
CVE-2026-93591
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-89, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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 <3.8.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <3.8.3

Published CVSS scores

7.6GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
7.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
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

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Technologies

Your stack

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Your stack

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