How severe is CVE-2026-40456?

CVE-2026-40456 has a CVSS 4.0 base score of 8.6, rated high severity.

Is CVE-2026-40456 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40456?

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

Does CVE-2026-40456 have an EU (EUVD) identifier?

Yes. CVE-2026-40456 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37875.

When was CVE-2026-40456 published?

CVE-2026-40456 was published on 2026-06-18 and last updated on 2026-06-22.

CVE-2026-40456

CVE-2026-40456 is a high-severity vulnerability with a CVSS 4.0 base score of 8.6. 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-78.

Key facts

Severity: High (CVSS 4.0 base score 8.6)
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37875
Weakness: CWE-78
Published: 2026-06-18
Last modified: 2026-06-22

Description

An OS Command Injection vulnerability exists in LMS (LAN Management System) before commit 9fcb4de due to an IP address parameter being passed to the "exec()" function without proper validation, allowing attackers to execute arbitrary operating system commands.

Frequently asked questions

What is CVE-2026-40456?: An OS Command Injection vulnerability exists in LMS (LAN Management System) before commit 9fcb4de due to an IP address parameter being passed to the "exec()" function without proper validation, allowing attackers to execute arbitrary operating system commands.
How severe is CVE-2026-40456?: CVE-2026-40456 has a CVSS 4.0 base score of 8.6, rated high severity.
Is CVE-2026-40456 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-40456?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40456 have an EU (EUVD) identifier?: Yes. CVE-2026-40456 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37875.
When was CVE-2026-40456 published?: CVE-2026-40456 was published on 2026-06-18 and last updated on 2026-06-22.

References

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