What is CVE-2026-48553?

CVE-2026-48553 is a high-severity vulnerability in Nagios Enterprises, Llc. Core, classified under OS Command Injection. CVSS score: 7.5/10. Published 2026-08-12.

How severe is CVE-2026-48553?

High severity. CVSS v3 base score is 7.5 out of 10.

RCE in Nagios Enterprises, Llc. Core

CVE-2026-48553

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, se…

Vulnerability class: Command Injection (OS Command Injection)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Nagios Enterprises, Llc. Core — versions 0
Nagios Enterprises, Llc. Xi — versions 0

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

disclosure@vulncheck.com (release-notes)
disclosure@vulncheck.com (vendor-advisory, patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-48553?: CVE-2026-48553 is a high-severity vulnerability in Nagios Enterprises, Llc. Core, classified under OS Command Injection. CVSS score: 7.5/10. Published 2026-08-12.
How severe is CVE-2026-48553?: High severity. CVSS v3 base score is 7.5 out of 10.