# CVE-2026-12489: CVE-2026-12489

Status: published. Published: 2026-10-20. Updated: 2026-11-04.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Zyxel / EX3501-T0 firmware: <= 5.44(ACHR.6)C0 (affected). Source: CNA: Zyxel

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N; source: CNA: Zyxel

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N; source: NVD: security@zyxel.com.tw

- CISA KEV: No listing in collected sources

- EPSS: 0.29% as of 2026-11-03; percentile 21.65%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-863

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- 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 (CNA: Zyxel; vendor-advisory)

- 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 (security@zyxel.com.tw)

## Provenance

- CNA: Zyxel: https://www.cve.org/CVERecord?id=CVE-2026-12489; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12489; retrieved 2026-11-04; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-12489; retrieved 2026-11-03; source updated Not reported

Revision: 214047166522d3800063cddf1c5b6c979f57451f5bbee581a8b1c7ada6cc4fa1

Canonical: https://y2.dev/cve/CVE-2026-12489

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