Vulnerability Description
Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 are vulnerable to authenticated remote code execution via custom-variable macro injection through the Nagios Remote Data Processor (NRDP). When a custom variable defined on a host, service, or contact is referenced in a shell-executed command line, an authenticated attacker with NRDP access can inject OS commands through the macro value. Exploitation requires a non-default configuration in which a custom variable is defined and referenced in a shell-executed command.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog
- https://www.nagios.com/security-disclosures/nagios-core/
- https://www.vulncheck.com/advisories/nagios-core-xi-authenticated-rce-via-custom
FAQ
What is CVE-2026-48553?
CVE-2026-48553 is a vulnerability with a CVSS score of 7.5 (HIGH). Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 are vulnerable to authenticated remote code execution via custom-variable macro injection through the Nagios Remote Data Processor (NRDP). When ...
How severe is CVE-2026-48553?
CVE-2026-48553 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48553?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.