Vulnerability · Published Aug 4, 2026 · Assigned by ASUSTOR1
CVE-2026-18759An improper authentication and path traversal vulnerability exists in ASUSTOR Backup Plan and ASUSTOR EZ Sync.
High 8.5
In plain English
A high-severity improper authentication in ABP from ASUSTOR Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ASUSTOR Inc. | ABP | ABP 2.0 – through 2.0.7.10171 |
| ASUSTOR Inc. | AES | AES 1.0 – through 1.1.1.3113 |
Weakness: CWE-287, CWE-269 · Vector: 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
References
- https://www.asustor.com/security/security_advisory_detail?id=70 vendor-advisory