CVE-2026-54066Public exploitNetwork attack vector

Unauthenticated file read via double-decoded asset paths

Published Jun 24, 2026 · Updated Jun 24, 2026

Path traversal in SiYuan before 3.7.0 allows remote attackers to read workspace files through the publish-mode asset route. The /assets/*path handler decodes encoded traversal segments twice, joins them outside DataDir, and then permits the resolved path without applying the sensitive-path check. Publish mode must be enabled; anonymous requests can expose configuration secrets, database content, and logs within WorkspaceDir.

CVSS severity7.5
High
EPSS probability2.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in SiYuan before 3.7.0 allows remote attackers to read workspace files through the publish-mode asset route. The /assets/*path handler decodes encoded traversal segments twice, joins them outside DataDir, and then permits the resolved path without applying the sensitive-path check. Publish mode must be enabled; anonymous requests can expose configuration secrets, database content, and logs within WorkspaceDir.

The record

CVE
CVE-2026-54066
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-22, CWE-23, CWE-1188, T1005, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=< 3.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=< 3.7.0

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 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-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-23Relative Path Traversal
CWE-1188Initialization of a Resource with an Insecure Default
T1005Data from Local System
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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