Zyxel EX3501T0 firmware <=5.44: DAL Auth flaw enables PrivEsc
CVE-2026-12489 Published on October 20, 2026

An incorrect authorization vulnerability in the Data Access Layer (DAL) of Zyxel EX3501-T0 firmware versions through 5.44(ACHR.6)C0 could allow an authenticated attacker to escalate privileges by modifying the login_privilege data on an affected device.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-12489 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
NONE
Availability Impact:
NONE

Weakness Type

What is an AuthZ Vulnerability?

The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.

CVE-2026-12489 has been classified to as an AuthZ vulnerability or weakness.


Affected Versions

Zyxel EX3501-T0 firmware Version <= 5.44(ACHR.6)C0 is affected by CVE-2026-12489