CVE-2026-48550

Name	CVE-2026-48550
Description	Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to reflected cross-site scripting in cmd.cgi via the NagFormId parameter. An unauthenticated remote attacker can craft a malicious link that, when followed by an authenticated user, executes arbitrary JavaScript in the victim's browser.
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)
Debian Bugs	1144495

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
	forky, sid	4.5.12+ds-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
nagios4	source	(unstable)	(unfixed)			1144495

Fixed by: https://github.com/NagiosEnterprises/nagioscore/commit/acd2365e816dda4a8dce61709f8d3a3b4ab04a6f (nagios-4.5.14)