{"id":"CVE-2026-48549","title":"Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 contains a CSRF vulnerability in cmd.cgi","summary":"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 …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","cwe":["CWE-352"],"published":"2026-08-26","updated":"2026-09-24","sourceUpdated":"2026-09-24T20:44:42.207","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-48549","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-csrf-via-cmd-cgi-double-submit-cookie","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00256,"epssPercentile":0.15308,"ingestedAt":"2026-09-24T20:51:40.230Z","slug":"CVE-2026-48549","body":"## Overview\n\nNagios 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}