CVE-2026-48548

Name	CVE-2026-48548
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
nagios4 (PTS)	bookworm, bookworm (security)	4.4.6-4+deb12u1	vulnerable
	trixie (security), trixie	4.4.6-4.1+deb13u1	vulnerable
	sid	4.5.12+ds-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
nagios4	source	(unstable)	4.5.12+ds-1

Fixed by: https://github.com/NagiosEnterprises/nagioscore/commit/e5ed38e53a5d65721520c7c67be0746d63da28cb (nagios-4.5.12)