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CVE-2026-18759— An improper authentication and path traversal vulnerability exists in ASUSTOR Backup Plan and ASUSTOR EZ Sync.

Quick assessment

Affected
ASUSTOR Inc. ABP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ASUSTOR ABP是中国ASUSTOR公司的一款Windows数据备份软件。 ASUSTOR ABP存在安全漏洞，该漏洞源于IPC通信密钥可被普通本地用户读取，服务未校验请求进程身份且路径校验存在缺陷，攻击者可通过目录遍历以 SYSTEM 权限读写任意文件，实现本地权限提升。

CVSS 8.5 · High EPSS 0.17% · P6

Affected Version Matrix 2

VendorProduct Version RangeStatus
ASUSTOR Inc. ABP ABP 2.0≤ 2.0.7.10171 affected
ASUSTOR Inc. AES AES 1.0≤ 1.1.1.3113 affected
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I. Basic Information for CVE-2026-18759

Vulnerability Information
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Vulnerability Title
An improper authentication and path traversal vulnerability exists in ASUSTOR Backup Plan and ASUSTOR EZ Sync.
Source: CVE Program / CVE List V5
Vulnerability Description
The background service of ABP or AES runs as NT AUTHORITY\SYSTEM and implements a file-based inter-process communication (IPC) mechanism protected by AES encryption. Because the encryption key file is readable by standard users and protected using DPAPI. Any authenticated local user can recover the key and forge valid IPC requests. Furthermore, the service does not check the identity of the requesting process and validates destination paths using an insufficient substring check. A local attacker can submit crafted encrypted requests containing directory traversal sequences to perform arbitrary file reads and arbitrary file writes as NT AUTHORITY\SYSTEM, leading to full local privilege escalation. Affected products and versions include: ABP (ASUSTOR Backup Plan) 2.0.7.10171 and earlier as well as AES (ASUSTOR EZSync) 1.1.1.3113 and earlier.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
ASUSTOR ABP 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ASUSTOR ABP是中国ASUSTOR公司的一款Windows数据备份软件。 ASUSTOR ABP存在安全漏洞，该漏洞源于IPC通信密钥可被普通本地用户读取，服务未校验请求进程身份且路径校验存在缺陷，攻击者可通过目录遍历以 SYSTEM 权限读写任意文件，实现本地权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ASUSTOR Inc. ABP ABP 2.0 ~ 2.0.7.10171 -
ASUSTOR Inc. AES AES 1.0 ~ 1.1.1.3113 -

II. Public POCs for CVE-2026-18759

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III. Intelligence Information for CVE-2026-18759

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Vendor Advisories for CVE-2026-18759 (1)

IV. Related Vulnerabilities

Same vendor: ASUSTOR Inc.
Same weakness: CWE-287

V. Comments for CVE-2026-18759

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