{"affected":[{"defaultStatus":"unaffected","product":"Nagios XI","source":"CNA: VulnCheck","vendor":"Nagios Enterprises, LLC","versions":[{"lessThan":"2026R2","status":"affected","version":"0","versionType":"custom"}]}],"cveId":"CVE-2026-119742","cwes":["CWE-78"],"description":"Nagios XI before 2026R2 contains an OS command injection vulnerability in the MIB upload feature where the install_mib() function in mibs.php sanitizes uploaded filenames with an incomplete character-substitution filter that omits semicolons, pipes, and non-space IFS whitespace characters before passing them to a grep command run via exec(). An authenticated administrator can upload a MIB file with a crafted filename using tab characters to bypass the deny-list and pipe to sh via a multipart POST request to mibs.php, resulting in arbitrary OS command execution as the web server user.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":8.6,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":7.2,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}],"modifiedAt":1793721618389,"publishedAt":1793713437505,"references":[{"source":"CNA: VulnCheck","tags":["release-notes","patch"],"url":"https://www.nagios.com/security-disclosures/nagios-xi/2026r2/"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/nagios-xi-2026r2-os-command-injection-via-mibs-php"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://www.nagios.com/security-disclosures/nagios-xi/2026r2/"}],"revision":"825bcc9387192ea0408332b5e54b52afdc190f07a8c906e028f87990e4ebfc85","sources":[{"modifiedAt":1793721618389,"name":"CNA: VulnCheck","retrievedAt":1793722148761,"url":"https://www.cve.org/CVERecord?id=CVE-2026-119742"}],"ssvc":{"assessedAt":1793721544070,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"Nagios XI < 2026R2 OS Command Injection via mibs.php","updatedAt":1793722148761}