---
id: CVE-2026-48554
title: >-
  Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to
  authenticated remote code execution via unfiltered NOTIFICATION-family macro
  substitution through the com_data parameter
summary: >-
  Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to
  authenticated remote code execution via unfiltered NOTIFICATION-family macro
  substitution through the com_data parameter. When a notification command
  references $N…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-78
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-2026-48554'
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-authenticated-rce-via-unfiltered-notification-family-macro-substitution
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00523
epssPercentile: 0.43388
ingestedAt: '2026-09-08T21:11:12.276Z'
---

## Overview

Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to authenticated remote code execution via unfiltered NOTIFICATION-family macro substitution through the com_data parameter. When a notification command references $NOTIFICATIONCOMMENT$ or $NOTIFICATIONAUTHOR$ in a shell-reachable position, authenticated UI users can run arbitrary commands as the nagios user. Exploitation requires a non-default configuration in which a notification command references these macros in a shell-executed command line.

## Remediation

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