CVE-2026-48554

Name of the Vulnerable Software and Affected Versions Nagios Core versions prior to 4.5.14 Nagios XI versions prior to 2026R1.7

Description Authenticated UI users can achieve remote code execution as the nagios user through unfiltered NOTIFICATION-family macro substitution via the com data parameter. This occurs when a notification command references the $NOTIFICATIONCOMMENT$ or $NOTIFICATIONAUTHOR$ macros in a shell-reachable position. Exploitation is possible only in non-default configurations where these macros are used within a shell-executed command line.

Recommendations Update Nagios Core to version 4.5.14 or later. Update Nagios XI to version 2026R1.7 or later.