CVE-2026-48548

Medium

Description

Nagios Core before 4.5.12 contains a cross-site request forgery vulnerability in cmd.cgi where the CSRF protection mechanism passes validation when the NagFormId cookie is absent. Attackers can craft a malicious cross-site POST request to execute arbitrary Nagios commands as a currently authenticated user without their knowledge or consent.

SeverityMedium

CVSS6.5

Exploit probability—

ProductNagios Core

PublishedAug 26, 2026

First seenAug 26, 2026

Weakness typeCWE-352Cross-site request forgery (CSRF)

How to fix

Update

Nagios Enterprises, LLC. Nagios Core4.5.12 or later

Patches

nagios.com/security-disclosures/nagios-core/

Vendor advisories

github.com/NagiosEnterprises/nagioscore/blob/master/Changelog

Affected products

Product	Affected versions	Fixed in
Nagios Enterprises, LLC. Nagios Core	v < 4.5.12	4.5.12

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