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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://www.nagios.com/changelog/nagios-xi/nagios-xi-2026r1-0-1/	Product Release Notes
https://www.zerodayinitiative.com/advisories/ZDI-26-072/	Third Party Advisory

Configurations

Configuration 1 (hide)

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

History

24 Feb 2026, 13:16

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~7.2~~	v2 : unknown v3 : 8.8
CPE		cpe:2.3:a:nagios:nagios_xi:2026:r1::::::
First Time		Nagios nagios Xi Nagios
References	~~() https://www.nagios.com/changelog/nagios-xi/nagios-xi-2026r1-0-1/ -~~	() https://www.nagios.com/changelog/nagios-xi/nagios-xi-2026r1-0-1/ - Product, Release Notes
References	~~() https://www.zerodayinitiative.com/advisories/ZDI-26-072/ -~~	() https://www.zerodayinitiative.com/advisories/ZDI-26-072/ - Third Party Advisory

20 Feb 2026, 23:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-02-20 23:16

Updated : 2026-02-24 13:16

NVD link : CVE-2026-2043

Mitre link : CVE-2026-2043

CVE.ORG link : CVE-2026-2043

JSON object : View

Products Affected

nagios

nagios_xi

CWE

CWE-78

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

{"id": "CVE-2026-2043", "cveTags": [], "metrics": {"cvssMetricV30": [{"type": "Secondary", "source": "zdi-disclosures@trendmicro.com", "cvssData": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 7.2, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "HIGH", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.2}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "published": "2026-02-20T23:16:04.517", "references": [{"url": "https://www.nagios.com/changelog/nagios-xi/nagios-xi-2026r1-0-1/", "tags": ["Product", "Release Notes"], "source": "zdi-disclosures@trendmicro.com"}, {"url": "https://www.zerodayinitiative.com/advisories/ZDI-26-072/", "tags": ["Third Party Advisory"], "source": "zdi-disclosures@trendmicro.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "zdi-disclosures@trendmicro.com", "description": [{"lang": "en", "value": "CWE-78"}]}], "descriptions": [{"lang": "en", "value": "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.\n\nThe 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."}], "lastModified": "2026-02-24T13:16:42.467", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:nagios:nagios_xi:2026:r1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DBAC321F-6345-4077-A82D-8CC02C21C358"}], "operator": "OR"}]}], "sourceIdentifier": "zdi-disclosures@trendmicro.com"}