CVE-2026-48549

Name	CVE-2026-48549
Description	Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 contains a CSRF vulnerability in cmd.cgi. When no Cookie header is present, the double-submit cookie protection can be bypassed by supplying matching NagFormId and nagFormId values in the POST body, allowing a cross-site request to execute Nagios commands as a currently authenticated user.
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)
References	DLA-4832-1, DSA-6556-1
Debian Bugs	1145888

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
nagios4 (PTS)	bookworm	4.4.6-4+deb12u1	vulnerable
	bookworm (security)	4.4.6-4+deb12u2	fixed
	trixie	4.4.6-4.1+deb13u1	vulnerable
	trixie (security)	4.4.6-4.1+deb13u2	fixed
	sid	4.5.14+ds-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
nagios4	source	bookworm	4.4.6-4+deb12u2	DLA-4832-1
nagios4	source	trixie	4.4.6-4.1+deb13u2	DSA-6556-1
nagios4	source	(unstable)	4.5.14+ds-1		1145888

Fixed by: https://github.com/NagiosEnterprises/nagioscore/commit/02aba584656eb10c2ff83a696b166f4bc7dd1304 (nagios-4.5.13)