CVE-2026-48550

EUVD-2026-57324
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.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.1 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 35.59%
Debian logo
Debian Releases
Debian Product
Codename
nagios4
bookworm
vulnerable
bookworm (security)
vulnerable
sid
vulnerable
trixie
vulnerable
trixie (security)
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
nagios4
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
Common Weakness Enumeration
References
https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog
https://www.nagios.com/security-disclosures/nagios-core/
https://www.vulncheck.com/advisories/nagios-core-xi-cmd-cgi-reflected-xss-via-nagformid-parameter