Vulnerability · Published Oct 20, 2026 · Assigned by Zyxel
CVE-2026-12489
Medium 6.5
In plain English
A medium-severity incorrect authorization in EX3501-T0 firmware from Zyxel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 78.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | EX3501-T0 firmware | <= 5.44(ACHR.6)C0 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N