CVE-2025-13593Hinoki check available

Local arbitrary-file write via installer origin validation

Published May 27, 2026 · Updated May 27, 2026

Origin validation error in Synology ActiveProtect Agent before 1.1.0-0439 allows local users to write restricted-content files during installation. Synology has not disclosed which installer component performs the faulty origin check or how untrusted installation input reaches the file-write operation. Exploitation requires local installation activity and user interaction; successful attacks can alter files with restricted content and interrupt the service.

CVSS severity6.1
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Origin validation error in Synology ActiveProtect Agent before 1.1.0-0439 allows local users to write restricted-content files during installation. Synology has not disclosed which installer component performs the faulty origin check or how untrusted installation input reaches the file-write operation. Exploitation requires local installation activity and user interaction; successful attacks can alter files with restricted content and interrupt the service.

The record

CVE
CVE-2025-13593
Published
May 27, 2026
Updated
May 27, 2026
Vendor
Synology
Product
ActiveProtect Agent
Classifications
CWE-346
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=* <1.1.0-0439

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Synology · ActiveProtect Agentversion=* <1.1.0-0439

Published CVSS scores

6.1Synology Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
5.6NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:H

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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