{"id":"CVE-2026-119742","aliases":["EUVD-2026-115824","GHSA-xgjr-r6p2-hvm3","UBUNTU-CVE-2026-119742"],"status":"published","title":"Nagios XI \u003c 2026R2 OS Command Injection via mibs.php","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.","severity":{"version":"4.0","score":8.6,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.04088,"percentile":0.90868,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-78"],"published":"2026-11-03T13:43:57Z","modified":"2026-11-05T11:47:26Z","affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"nagios3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.5.1-1ubuntu4","3.5.1.dfsg-2ubuntu1","3.5.1.dfsg-2ubuntu2","3.5.1.dfsg-2.1ubuntu1","3.5.1.dfsg-2.1ubuntu1.1","3.5.1.dfsg-2.1ubuntu1.2","3.5.1.dfsg-2.1ubuntu1.3"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"icinga","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.3-1","1.13.3-2","1.13.3-2ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"icinga","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.4-2build1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"nagios3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.5.1.dfsg-2.1ubuntu8"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"nagios4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.4-3","4.3.4-3ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"nagios4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.6-4","4.4.6-4ubuntu0.22.04.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"nagios4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.6-4","4.4.6-4ubuntu0.24.04.1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"nagios4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.6-4.1ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"nagios4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.6-4.1ubuntu1","4.4.6-4.1ubuntu2"]}],"products":[{"vendor":"nagios enterprises","product":"nagios xi"},{"vendor":"nagios enterprises, llc","product":"nagios xi"}],"references":[{"url":"https://www.nagios.com/security-disclosures/nagios-xi/2026r2/","tags":["release-notes","patch","report"]},{"url":"https://www.vulncheck.com/advisories/nagios-xi-2026r2-os-command-injection-via-mibs-php","tags":["third-party-advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119742"},{"url":"https://www.nagios.com/security-disclosures/nagios-xi/2026r2"},{"url":"https://github.com/advisories/GHSA-xgjr-r6p2-hvm3"},{"url":"https://ubuntu.com/security/CVE-2026-119742","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-119742","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-119742","title":"Nagios XI \u003c 2026R2 OS Command Injection via mibs.php","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.","status":"published","published":"2026-11-03T13:43:57.505Z","modified":"2026-11-03T16:00:18.389Z","cvss":[{"version":"4.0","score":8.6,"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","level":"high","assessor":"cna"},{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-78"],"updated_at":"2026-11-03T16:58:09.635057Z"}],"euvd":[{"id":"EUVD-2026-115824","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.","status":"published","published":"2026-11-03T13:43:57Z","modified":"2026-11-03T16:00:18Z","cvss":[{"version":"4.0","score":8.6,"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","level":"high"}],"updated_at":"2026-11-03T18:19:04.847003Z"}],"ghsa":[{"id":"GHSA-xgjr-r6p2-hvm3","title":"Nagios XI before 2026R2 contains an OS command injection vulnerability in the MIB upload feature...","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.","status":"published","published":"2026-11-03T15:31:50Z","modified":"2026-11-03T15:32:00Z","cvss":[{"version":"4.0","score":8.6,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-78"],"updated_at":"2026-11-03T17:59:57.372966Z"}],"nvd":[{"id":"CVE-2026-119742","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.","status":"published","published":"2026-11-03T14:17:34.843Z","modified":"2026-11-03T16:25:21.31Z","cvss":[{"version":"4.0","score":8.6,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-78"],"updated_at":"2026-11-03T18:16:47.713454Z"}],"osv":[{"id":"UBUNTU-CVE-2026-119742","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.","status":"published","published":"2026-11-03T14:17:00Z","modified":"2026-11-05T11:47:26.681558567Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high"},{"version":"4.0","score":8.6,"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","level":"high"}],"updated_at":"2026-11-05T13:30:15.321876Z"}]}}