How severe is CVE-2018-11426?

CVE-2018-11426 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-11426 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-11426?

CVE-2018-11426 primarily affects Moxa Oncell G3150-hspa Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-11426?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-11426 published?

CVE-2018-11426 was published on 2019-07-03 and last updated on 2026-06-17.

CVE-2018-11426

CVE-2018-11426 is a critical-severity vulnerability in Moxa Oncell G3150-hspa Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Moxa Oncell G3150-hspa Firmware
Published: 2019-07-03
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2018-11426?: CVE-2018-11426 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-11426 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-11426?: CVE-2018-11426 primarily affects Moxa Oncell G3150-hspa Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-11426?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-11426 published?: CVE-2018-11426 was published on 2019-07-03 and last updated on 2026-06-17.

References

https://github.com/klsecservices/Advisories/blob/master/KL-MOXA-2018-105.md

Affected products (2)

cpe:2.3:o:moxa:oncell_g3150-hspa_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:oncell_g3150-hspa-t_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Moxa Oncell G3150-hspa Firmware

CVE-2018-11422 — Critical (CVSS 9.8): Moxa OnCell G3100-HSPA Series version 1.6 Build 17100315 and prior use a proprietary configuration protocol that does…
CVE-2018-11421 — Critical (CVSS 9.8): Moxa OnCell G3100-HSPA Series version 1.6 Build 17100315 and prior use a proprietary monitoring protocol that does not…
CVE-2018-11420 — Critical (CVSS 9.8): There is Memory corruption in the web interface of Moxa OnCell G3100-HSPA Series version 1.5 Build 17042015 and prio,r…
CVE-2018-5455 — Critical (CVSS 9.8): A Reliance on Cookies without Validation and Integrity Checking issue was discovered in Moxa OnCell G3100-HSPA Series…
CVE-2018-11427 — High (CVSS 8.8): CSRF tokens are not used in the web application of Moxa OnCell G3100-HSPA Series version 1.4 Build 16062919 and prior,…
CVE-2018-11423 — High (CVSS 7.5): There is Memory corruption in the web interface Moxa OnCell G3100-HSPA Series version 1.6 Build 17100315 and prior,…

All CVEs affecting Moxa Oncell G3150-hspa Firmware →

Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →