CVE-2026-82233Public exploitNetwork attack vectorHinoki check available

Local file disclosure via unchecked asset path

Published Aug 28, 2026 · Updated Aug 28, 2026

Path traversal in SiYuan before 3.8.1 allows remote authenticated users to read arbitrary local files through the asset.upload MCP tool. assetUpload converts each supplied file string with filepath.Abs but does not enforce IsSubPath or IsSensitivePath, and InsertLocalAssets opens and copies the resulting path into workspace assets. The Agent/MCP surface must be configured, attacker-controlled content must steer the Agent, and a user must approve the upload; the approval omits the source path, while the consequence is limited to confidentiality.

CVSS severity6.9
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Path traversal in SiYuan before 3.8.1 allows remote authenticated users to read arbitrary local files through the asset.upload MCP tool. assetUpload converts each supplied file string with filepath.Abs but does not enforce IsSubPath or IsSensitivePath, and InsertLocalAssets opens and copies the resulting path into workspace assets. The Agent/MCP surface must be configured, attacker-controlled content must steer the Agent, and a user must approve the upload; the approval omits the source path, while the consequence is limited to confidentiality.

The record

CVE
CVE-2026-82233
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-22, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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 <3.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <3.8.1

Published CVSS scores

5.7VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/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-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

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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