CVE-2026-40852 | Command injection via malicious configuration

A highly authenticated attacker can alter the config generator injecting a payload into future created configurations. The device is not correctly checking this configuration value before passing it to an system execute leading to code execution. This can result in a total loss of confidentiality, integrity and availability.

Published: 2026-05-27 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-40852 is rated Moderate Risk (40.1/100): CVSS High severity, with low exploitation likelihood (EPSS 0.40%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-40852

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.07% 0.40% +0.32%
2 2026-05-27 — 0.07% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-40852

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.2 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.2 5.9 [email protected]

Weakness enumeration for CVE-2026-40852

GitHub Security Advisory for CVE-2026-40852

GHSA-4334-w3q6-m8g5 · Severity: high — A highly authenticated attacker can alter the config generator injecting a payload into future...

Affected software / configurations for CVE-2026-40852

Vendor Product Version Raw CPE
mb_connect_line mbnet_mbnet.rokey >= 0.0.0, <= 8.4.4 cpe:2.3:a:mb_connect_line:mbnet_mbnet.rokey:*:*:*:*:*:*:*:*
mb_connect_line mbnet.mini >= 0.0.0, <= 3.0.2 cpe:2.3:a:mb_connect_line:mbnet.mini:*:*:*:*:*:*:*:*
mb_connect_line mbnet >= 8.4.4 cpe:2.3:o:mb_connect_line:mbnet:8.4.4:*:*:*:*:*:*:*
mb_connect_line mbnet.mini >= 3.0.2 cpe:2.3:o:mb_connect_line:mbnet.mini:3.0.2:*:*:*:*:*:*:*
helmholz rex200_250 >= 0.0.0, <= 8.4.4 cpe:2.3:a:helmholz:rex200_250:*:*:*:*:*:*:*:*
helmholz rex100 >= 0.0.0, <= 3.0.2 cpe:2.3:a:helmholz:rex100:*:*:*:*:*:*:*:*
helmholz rex200_250 >= 8.4.4 cpe:2.3:o:helmholz:rex200_250:8.4.4:*:*:*:*:*:*:*
helmholz rex100 >= 3.0.2 cpe:2.3:o:helmholz:rex100:3.0.2:*:*:*:*:*:*:*

References for CVE-2026-40852

cvelogic Threat Intelligence