CVE-2026-68587Public exploitNetwork attack vectorHinoki check available

Restricted-document disclosure via unchecked heading transactions

Published Aug 3, 2026 · Updated Aug 3, 2026

Missing authorization in SiYuan before 3.7.3 allows remote attackers to read publish-disabled documents through heading transaction endpoints. The getHeadingDeleteTransaction, getHeadingLevelTransaction, and getHeadingInsertTransaction handlers render a heading subtree into returned operation data without applying the publish-access filter. Anonymous publish access or a RoleReader token and a known heading block ID are sufficient; the path discloses full rendered content but does not modify data.

CVSS severity9.2
Critical
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Missing authorization in SiYuan before 3.7.3 allows remote attackers to read publish-disabled documents through heading transaction endpoints. The getHeadingDeleteTransaction, getHeadingLevelTransaction, and getHeadingInsertTransaction handlers render a heading subtree into returned operation data without applying the publish-access filter. Anonymous publish access or a RoleReader token and a known heading block ID are sufficient; the path discloses full rendered content but does not modify data.

The record

CVE
CVE-2026-68587
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 <3.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <3.7.3

Published CVSS scores

9.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
8.6VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A: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-862Missing Authorization
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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