CVE-2026-48554: Nagios Enterprises, Llc Nagios Core

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• Nagios Enterprises, Llc Nagios Core: before 4.5.14 (fixed in 4.5.14)
• Nagios Enterprises, Llc Nagios XI: before 2026R1.7 (fixed in 2026R1.7)

Published 2026-08-12. Last modified 2026-09-08.