How severe is CVE-2026-2043?

CVE-2026-2043 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-2043 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 74% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-2043?

CVE-2026-2043 affects Nagios Nagios Xi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-2043?

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-2026-2043 have an EU (EUVD) identifier?

Yes. CVE-2026-2043 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7770.

When was CVE-2026-2043 published?

CVE-2026-2043 was published on 2026-02-20 and last updated on 2026-06-17.

CVE-2026-2043

CVE-2026-2043 is a high-severity vulnerability in Nagios Nagios Xi with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 74% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 74% (99th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7770
Weakness: CWE-78
Affected product: Nagios Nagios Xi
Published: 2026-02-20
Last modified: 2026-06-17

Description

Nagios Host esensors_websensor_configwizard_func Command Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Nagios Host. Authentication is required to exploit this vulnerability. The specific flaw exists within the esensors_websensor_configwizard_func method. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-28249.

Frequently asked questions

What is CVE-2026-2043?: Nagios Host esensors_websensor_configwizard_func Command Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Nagios Host. Authentication is required to exploit this vulnerability. The specific flaw exists within the esensors_websensor_configwizard_func method. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-28249.
How severe is CVE-2026-2043?: CVE-2026-2043 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-2043 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 74% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-2043?: CVE-2026-2043 affects Nagios Nagios Xi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-2043?: 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-2026-2043 have an EU (EUVD) identifier?: Yes. CVE-2026-2043 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7770.
When was CVE-2026-2043 published?: CVE-2026-2043 was published on 2026-02-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nagios:nagios_xi:2026:r1:*:*:*:*:*:*

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