CVE-2026-48554
Nagios Core / XI Authenticated RCE via Unfiltered NOTIFICATION-Family Macro Substitution
- State
- Published
- Severity
- 7.7 High
- Published
- Aug 12, 2026
- Updated
- Aug 14, 2026
- Reserved
- May 21, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.7 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Products
| Product | Versions |
|---|---|
Nagios CoreNagios Enterprises, LLC. |
|
Nagios XINagios Enterprises, LLC. |
|
References
- Security Disclosuresvendor-advisorypatch
- Changelogrelease-notes
- https://www.vulncheck.com/advisories/nagios-core-xi-authenticated-rce-via-unfiltered-notification-family-macro-substitutionthird-party-advisory
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