Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 contains a CSRF vulnerability in cmd.cgi. When no Cookie header is present, the double-submit cookie protection can be bypassed by supplying matching NagFormId and nagFormId values in the POST body, allowing a cross-site request to execute Nagios commands as a currently authenticated user.

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.

Key SSVC decision points have not yet been added.

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 < 4.5.13
Nagios Enterprises, LLC. Nagios XI affected
Version Status Constraints
0 affected < 2026R1.5

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

No data.

Project Subscriptions

Vendors Products
Nagios Subscribe
Nagios Core Subscribe
Nagios Xi 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-xi-csrf-via-cmd-cgi-double-submit-cookie cve-icon cve-icon
History

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

Type Values Removed Values Added
Description Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 contains a CSRF vulnerability in cmd.cgi. When no Cookie header is present, the double-submit cookie protection can be bypassed by supplying matching NagFormId and nagFormId values in the POST body, allowing a cross-site request to execute Nagios commands as a currently authenticated user.
Title Nagios Core / XI CSRF via cmd.cgi Double-Submit Cookie
First Time appeared Nagios
Nagios nagios Core
Nagios nagios Xi
Weaknesses CWE-352
CPEs cpe:2.3:a:nagios:nagios_core:*:*:*:*:*:*:*:*
cpe:2.3:a:nagios:nagios_xi:*:*:*:*:*:*:*:*
Vendors & Products Nagios
Nagios nagios Core
Nagios nagios Xi
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

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-26T15:37:20.083Z

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

Link: CVE-2026-48549

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-26T16:16:26.967

Modified: 2026-08-26T16:16:26.967

Link: CVE-2026-48549

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-26T18:00:04Z

Weaknesses