Incorrect Authorization Vulnerability in Zyxel EX3501-T0 Firmware
CVE-2026-12489

6.5MEDIUM

Key Information:

Vendor

Zyxel
Status
Ex3501-t0 Firmware
Vendor
CVE Published:
20 October 2026

What is CVE-2026-12489?

An incorrect authorization vulnerability has been identified in the Data Access Layer (DAL) of Zyxel EX3501-T0 firmware, which could permit an authenticated attacker to escalate privileges by manipulating login_privilege data on the device. This flaw can potentially allow unauthorized users to gain elevated access rights, compromising the security and integrity of the affected systems.

Affected Version(s)

EX3501-T0 firmware <= 5.44(ACHR.6)C0

References

https://www.zyxel.com/global/en/support/security-advisori...
vendor-advisory

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.