---
id: CVE-2026-12489
title: >-
  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 …
summary: >-
  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 …
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-863
vendor: Zyxel
product: EX3501-T0 firmware
affected:
  - ex3501-t0_firmware <= 5.44(ACHR.6)C0
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T02:04:49.838Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-12489'
references:
  - url: >-
      https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-incorrect-authorization-vulnerability-in-the-dal-of-certain-5g-nr-cpe-dsl-ethernet-cpe-fiber-onts-and-wireless-extenders-10-20-2026
tags:
  - cve.org
ingestedAt: '2026-10-20T02:51:19.462Z'
---

## Overview

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.

## Affected

- `ex3501-t0_firmware <= 5.44(ACHR.6)C0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.