Nagios Core before 4.5.12 contains a cross-site request forgery vulnerability in cmd.cgi where the CSRF protection mechanism passes validation when the NagFormId cookie is absent. Attackers can craft a malicious cross-site POST request to execute arbitrary Nagios commands as a currently authenticated user without their knowledge or consent.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Active

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Nagios Enterprises, LLC. Nagios Core affected
Version Status Constraints
0 affected < 4.5.12

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Project Subscriptions

Vendors Products
Nagios Subscribe
Nagios Core Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog cve-icon cve-icon
https://www.nagios.com/security-disclosures/nagios-core/ cve-icon cve-icon
https://www.vulncheck.com/advisories/nagios-core-csrf-via-cmd-cgi cve-icon cve-icon
History

Wed, 26 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 26 Aug 2026 16:00:00 +0000

Type Values Removed Values Added
Description Nagios Core before 4.5.12 contains a cross-site request forgery vulnerability in cmd.cgi where the CSRF protection mechanism passes validation when the NagFormId cookie is absent. Attackers can craft a malicious cross-site POST request to execute arbitrary Nagios commands as a currently authenticated user without their knowledge or consent.
Title Nagios Core CSRF via cmd.cgi
First Time appeared Nagios
Nagios nagios Core
Weaknesses CWE-352
CPEs cpe:2.3:a:nagios:nagios_core:*:*:*:*:*:*:*:*
Vendors & Products Nagios
Nagios nagios Core
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-26T17:29:31.213Z

Reserved: 2026-05-21T18:34:46.418Z

Link: CVE-2026-48548

cve-icon Vulnrichment

Updated: 2026-08-26T17:29:23.539Z

cve-icon NVD

Status : Received

Published: 2026-08-26T16:16:26.790

Modified: 2026-08-26T18:16:33.860

Link: CVE-2026-48548

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-26T17:30:10Z

Weaknesses