Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 contain a cross-site request forgery protection bypass via a self-supplied double-submit cookie. An attacker can supply matching cookie and request parameter values to bypass CSRF protection, enabling unauthenticated attackers to run commands as authorized users via malicious links.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Active

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact High

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

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 < 4.5.14
Nagios Enterprises, LLC. Nagios XI affected
Version Status Constraints
0 affected < 2026R1.7

No data.

No data.

No data.

Project Subscriptions

No data.

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-protection-bypass-via-double-submit-cookie cve-icon cve-icon
History

Wed, 12 Aug 2026 16:45:00 +0000

Type Values Removed Values Added
Description Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 contain a cross-site request forgery protection bypass via a self-supplied double-submit cookie. An attacker can supply matching cookie and request parameter values to bypass CSRF protection, enabling unauthenticated attackers to run commands as authorized users via malicious links.
Title Nagios Core / XI CSRF Protection Bypass via Double-Submit Cookie
Weaknesses CWE-352
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N'}

cvssV4_0

{'score': 6.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-12T16:32:16.601Z

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

Link: CVE-2026-48551

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-12T17:17:27.353

Modified: 2026-08-12T17:17:27.353

Link: CVE-2026-48551

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses