What is CVE-2018-11426?

CVE-2018-11426 is a critical-severity vulnerability in Moxa Oncell G3150-Hspa, classified under Improper Authentication. CVSS score: 9.8/10. Published 2019-07-03.

How severe is CVE-2018-11426?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Moxa Oncell G3150-Hspa

CVE-2018-11426

A weak Cookie parameter is used in the web application of Moxa OnCell G3100-HSPA Series version 1.4 Build 16062919 and prior. An attacker can brute force parameters required to bypass authentication and access the web interface to use all its functions except for password change.

Vulnerability class: Broken Authentication

Published 2019-07-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (78.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

github.com/klsecservices/Advisories/blob/master/KL-MOXA-2018-105.md (Third Party Advisory)

Frequently asked questions

What is CVE-2018-11426?: CVE-2018-11426 is a critical-severity vulnerability in Moxa Oncell G3150-Hspa, classified under Improper Authentication. CVSS score: 9.8/10. Published 2019-07-03.
How severe is CVE-2018-11426?: Critical severity. CVSS v3 base score is 9.8 out of 10.