CVE-2026-86191Public exploitNetwork attack vector

Private database schema disclosure via missing visibility check

Published Sep 5, 2026 · Updated Sep 8, 2026

Information disclosure in SiYuan before 3.8.2 allows remote authenticated users to read private database key schemas through a publish endpoint. The getAttributeViewKeysByID handler calls model.GetAttributeViewKeysByID directly, parsing the attribute-view file and returning requested keys without checking whether a parent database is publish-visible. Publish-reader access and a valid attribute-view ID are required; successful requests disclose field names, definitions, and relation targets from hidden databases.

CVSS severity5.3
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in SiYuan before 3.8.2 allows remote authenticated users to read private database key schemas through a publish endpoint. The getAttributeViewKeysByID handler calls model.GetAttributeViewKeysByID directly, parsing the attribute-view file and returning requested keys without checking whether a parent database is publish-visible. Publish-reader access and a valid attribute-view ID are required; successful requests disclose field names, definitions, and relation targets from hidden databases.

The record

CVE
CVE-2026-86191
Published
Sep 5, 2026
Updated
Sep 8, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-639, T1213.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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 <3.8.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <3.8.2

Published CVSS scores

4.3VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
5.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1213.006Data from Information Repositories: Databases

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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