CVE-2026-74798Public exploitNetwork attack vector

Arbitrary file read and deletion via path traversal

Published Aug 17, 2026 · Updated Aug 18, 2026

Path traversal in the database_clean MCP tool in SiYuan before 3.7.4 allows remote authenticated users to read and delete files via a crafted id value. The databaseClean MCP handler passes any non-empty id to RemoveUnusedAttributeView, which joins id plus .json into the attribute-view storage path with filepath.Join, copies the resolved file into SiYuan's history directory, and then removes the original without validating that id matches a node ID or stays under data/storage/av. Exploitation requires access to the authenticated /mcp surface, with the GitHub advisory stating that the endpoint is admin-gated, and exposes any file readable by the SiYuan process while deleting the source file.

CVSS severity9.3
Critical
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Path traversal in the database_clean MCP tool in SiYuan before 3.7.4 allows remote authenticated users to read and delete files via a crafted id value. The databaseClean MCP handler passes any non-empty id to RemoveUnusedAttributeView, which joins id plus .json into the attribute-view storage path with filepath.Join, copies the resolved file into SiYuan's history directory, and then removes the original without validating that id matches a node ID or stays under data/storage/av. Exploitation requires access to the authenticated /mcp surface, with the GitHub advisory stating that the endpoint is admin-gated, and exposes any file readable by the SiYuan process while deleting the source file.

The record

CVE
CVE-2026-74798
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-22, T1005, T1485
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 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 privilegesadmin

What is affected?

SiYuan Note · SiYuanversion=0 <3.7.4

Published CVSS scores

8.7VulnCheckCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
7.2GitHubCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System
T1485Data Destruction

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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