CVE-2026-48551

Name	CVE-2026-48551
Description	Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 contain a cross-site request forgery protection bypass via a self-supplied double-submit cookie. An attacker can supply matching cookie and request parameter values to bypass CSRF protection, enabling unauthenticated attackers to run commands as authorized users via malicious links.
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	1144495

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		1144495

Fixed by: https://github.com/NagiosEnterprises/nagioscore/commit/bcd4c2a4b5dfe51bdb2b227af8945ad8751a820d (nagios-4.5.14)