CVE-2026-48554

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductNagios Core

PublishedAug 12, 2026

First seenAug 12, 2026

Weakness typeCWE-78OS command injection

How to fix

Update

Nagios Enterprises, LLC. Nagios Core4.5.14 or later
Nagios Enterprises, LLC. Nagios XI2026R1.7 or later

Patches

nagios.com/security-disclosures/nagios-core/

Vendor advisories

github.com/NagiosEnterprises/nagioscore/blob/master/Changelog

Affected products

Product	Affected versions	Fixed in
Nagios Enterprises, LLC. Nagios Core	v < 4.5.14	4.5.14
Nagios Enterprises, LLC. Nagios XI	v < 2026R1.7	2026R1.7

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