CVE-2026-18759

Local SYSTEM escalation via forged traversal IPC requests

Published Aug 4, 2026 · Updated Aug 4, 2026

Improper authentication in ASUSTOR Backup Plan 2.0.7.10171 and earlier and EZ Sync 1.1.1.3113 and earlier allows local users to gain SYSTEM access. The SYSTEM service accepts file-based IPC encrypted with a standard-user-readable DPAPI-protected key, omits requester identity checks, and tests destination paths with a substring match that traversal sequences bypass. Any authenticated local user can forge requests that read or write arbitrary files as SYSTEM, enabling complete local privilege escalation.

CVSS severity8.5
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in ASUSTOR Backup Plan 2.0.7.10171 and earlier and EZ Sync 1.1.1.3113 and earlier allows local users to gain SYSTEM access. The SYSTEM service accepts file-based IPC encrypted with a standard-user-readable DPAPI-protected key, omits requester identity checks, and tests destination paths with a substring match that traversal sequences bypass. Any authenticated local user can forge requests that read or write arbitrary files as SYSTEM, enabling complete local privilege escalation.

The record

CVE
CVE-2026-18759
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
ASUSTOR Inc.
Product
ASUSTOR EZ Sync
Classifications
CWE-269, CWE-287, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=AES 1.0 <=1.1.1.3113

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

ASUSTOR Inc. · ASUSTOR EZ Syncversion=AES 1.0 <=1.1.1.3113
ASUSTOR Inc. · ASUSTOR Backup Planversion=ABP 2.0 <=2.0.7.10171

Published CVSS scores

8.5ASUSTOR Inc.CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
CWE-287Improper Authentication
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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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