{"id":"CVE-2026-48553","title":"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)","summary":"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, …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-78"],"published":"2026-08-12","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:28:37.587","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-48553","references":[{"url":"https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog","label":"disclosure@vulncheck.com"},{"url":"https://www.nagios.com/security-disclosures/nagios-core/","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/nagios-core-xi-authenticated-rce-via-custom-variable-macro-injection","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00966,"epssPercentile":0.60083,"ingestedAt":"2026-09-08T21:11:12.276Z","slug":"CVE-2026-48553","body":"## Overview\n\nNagios 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}