---
id: CVE-2026-48551
title: >-
  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
summary: >-
  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 p…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N'
cwe:
  - CWE-352
published: '2026-08-12'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:28:37.587'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48551'
references:
  - url: 'https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog'
    label: disclosure@vulncheck.com
  - url: 'https://www.nagios.com/security-disclosures/nagios-core/'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/nagios-core-xi-csrf-protection-bypass-via-double-submit-cookie
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00264
epssPercentile: 0.16347
ingestedAt: '2026-09-08T21:11:12.276Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.