CVE-2026-73605Public exploitNetwork attack vector

Filesystem existence disclosure via unconstrained path probe

Published Aug 13, 2026 · Updated Aug 13, 2026

Path traversal in SiYuan before 3.7.4 allows remote attackers to determine whether arbitrary host files and directories exist. The /api/file/getUniqueFilename handler sends an unvalidated request-body path through GetUniqueFilename to gulu.File.IsExist without workspace confinement, and its suffix-changing response reveals existence. Reachability requires publish mode with anonymous access or a RoleReader account; the oracle exposes only path existence and layout, not file contents or writes.

CVSS severity6.9
Medium
EPSS probability0.19%
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 3.7.4 allows remote attackers to determine whether arbitrary host files and directories exist. The /api/file/getUniqueFilename handler sends an unvalidated request-body path through GetUniqueFilename to gulu.File.IsExist without workspace confinement, and its suffix-changing response reveals existence. Reachability requires publish mode with anonymous access or a RoleReader account; the oracle exposes only path existence and layout, not file contents or writes.

The record

CVE
CVE-2026-73605
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-862, T1083
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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 <3.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <3.7.4

Published CVSS scores

5.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1083File and Directory Discovery

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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