CVE-2026-48553Nagios Core / XI Authenticated RCE via Custom-Variable Macro Injection
Updated under an hour ago ()
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It affects Nagios Enterprises, LLC. Nagios Core and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-78
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Awaiting Analysis
- Record last updated
- Aug 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Nagios Enterprises, LLC. Nagios Core nagios_enterprises:nagios_core (from the name) | before 4.5.13 | CNA record |
Nagios Enterprises, LLC. Nagios XI nagios_enterprises:nagios_xi (from the name) | before 2026R1.5 | CNA record |
References
- https://www.nagios.com/security-disclosures/nagios-core/vendor-advisory, patch
- https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelogrelease-notes
- https://www.vulncheck.com/advisories/nagios-core-xi-authenticated-rce-via-custom-variable-macro-injectionthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.