CVE-2026-68586Public exploitNetwork attack vector

Content disclosure via unfiltered backlink endpoints

Published Aug 3, 2026 · Updated Aug 3, 2026

Missing authorization in SiYuan before 3.7.3 allows remote attackers to read publish-forbidden document content through backlink APIs. The getBacklinkDoc and getBackmentionDoc endpoints return rendered DOM without applying the publish-access filters used by their list counterparts. Reachability requires a publish reader and valid document and block IDs; access is anonymous when publish Basic Auth is disabled, and the endpoints do not modify data.

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

What happened

Missing authorization in SiYuan before 3.7.3 allows remote attackers to read publish-forbidden document content through backlink APIs. The getBacklinkDoc and getBackmentionDoc endpoints return rendered DOM without applying the publish-access filters used by their list counterparts. Reachability requires a publish reader and valid document and block IDs; access is anonymous when publish Basic Auth is disabled, and the endpoints do not modify data.

The record

CVE
CVE-2026-68586
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
8.6GitHubCVSS: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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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