Nagios Core <4.5.14 RCE via unfiltered NOTIFICATION macro in com_data
CVE-2026-48554 Published on August 12, 2026
Nagios Core / XI Authenticated RCE via Unfiltered NOTIFICATION-Family Macro Substitution
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.
Vulnerability Analysis
CVE-2026-48554 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is a Shell injection Vulnerability?
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CVE-2026-48554 has been classified to as a Shell injection vulnerability or weakness.
Products Associated with CVE-2026-48554
stack.watch emails you whenever new vulnerabilities are published in Nagios Core or Nagios Xi. Just hit a watch button to start following.
Affected Versions
Nagios Enterprises, LLC. Nagios Core:- Before 4.5.14 is affected.
- Before 2026R1.7 is affected.