{"id":"CVE-2026-48550","title":"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","summary":"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 auth…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-79"],"published":"2026-08-12","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:28:37.587","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-48550","references":[{"url":"https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog","label":"disclosure@vulncheck.com"},{"url":"https://www.nagios.com/security-disclosures/nagios-core/","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/nagios-core-xi-cmd-cgi-reflected-xss-via-nagformid-parameter","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00266,"epssPercentile":0.18738,"ingestedAt":"2026-09-08T21:11:12.276Z","slug":"CVE-2026-48550","body":"## Overview\n\nNagios 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}