{"id":"CVE-2026-23920","aliases":["DEBIAN-CVE-2026-23920","EUVD-2026-14952","GHSA-2h5x-h7x4-hm9h","UBUNTU-CVE-2026-23920"],"status":"published","title":"Host and event action script regex validation can be bypassed in certain situations, leading to potential command injection","description":"Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.","severity":{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00309,"percentile":0.23886,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-78"],"published":"2026-03-24T18:27:52Z","modified":"2026-10-24T14:58:38Z","fixes":[{"ecosystem":"Debian:13","package":"zabbix","fixed_in":["1:7.0.22+dfsg-1~deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"zabbix","fixed_in":["1:7.0.22+dfsg-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"zabbix","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:6.0.14+dfsg-1","1:6.0.23+dfsg-1","1:6.0.23+dfsg-1~bpo12+1","1:6.0.24+dfsg-1","1:6.0.25+dfsg-1","1:6.0.29+dfsg-1","1:7.0.0+dfsg-1","1:7.0.0+dfsg-2","1:7.0.0+dfsg-2~bpo12+1","1:7.0.1+dfsg-1","1:7.0.1+dfsg-1~bpo12+1","1:7.0.10+dfsg-1","1:7.0.10+dfsg-2","1:7.0.2+dfsg-1","1:7.0.2+dfsg-1~bpo12+1","1:7.0.22+dfsg-1","1:7.0.22+dfsg-1.1","1:7.0.22+dfsg-1~bpo13+1","1:7.0.22+dfsg-1~deb13u1","1:7.0.27+dfsg-1","1:7.0.29+dfsg-1","1:7.0.29+dfsg-2","1:7.0.29+dfsg-2~bpo13+1","1:7.0.3+dfsg-1","1:7.0.5+dfsg-1","1:7.0.5+dfsg-1~bpo12+1","1:7.0.6+dfsg-1","1:7.0.9+dfsg-1","1:7.0.9+dfsg-1~bpo12+1"]},{"source":"osv","ecosystem":"Debian:13","package":"zabbix","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.0.22+dfsg-1~deb13u1"}]}],"versions":["1:7.0.10+dfsg-2","1:7.0.22+dfsg-1~bpo13+1"]},{"source":"osv","ecosystem":"Debian:14","package":"zabbix","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.0.22+dfsg-1"}]}],"versions":["1:7.0.10+dfsg-2","1:7.0.22+dfsg-1~bpo13+1","1:7.0.22+dfsg-1~deb13u1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"zabbix","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.0.6+dfsg-1ubuntu2","1:2.2.0+dfsg-1ubuntu1","1:2.2.0+dfsg-6ubuntu1","1:2.2.1+dfsg-1ubuntu3","1:2.2.2+dfsg-1ubuntu1","1:2.2.2+dfsg-1ubuntu1+esm1","1:2.2.2+dfsg-1ubuntu1+esm3","1:2.2.2+dfsg-1ubuntu1+esm4","1:2.2.2+dfsg-1ubuntu1+esm5"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"zabbix","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.4.6+dfsg-1","1:2.4.7+dfsg-1","1:2.4.7+dfsg-2","1:2.4.7+dfsg-2ubuntu2","1:2.4.7+dfsg-2ubuntu2.1","1:2.4.7+dfsg-2ubuntu2.1+esm1","1:2.4.7+dfsg-2ubuntu2.1+esm2","1:2.4.7+dfsg-2ubuntu2.1+esm3","1:2.4.7+dfsg-2ubuntu2.1+esm4"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"zabbix","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:3.0.7+dfsg-3","1:3.0.12+dfsg-1","1:3.0.12+dfsg-1ubuntu0.1~esm1","1:3.0.12+dfsg-1ubuntu0.1~esm2","1:3.0.12+dfsg-1ubuntu0.1~esm3","1:3.0.12+dfsg-1ubuntu0.1~esm4"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"zabbix","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.0.4+dfsg-1build2","1:4.0.4+dfsg-1build3","1:4.0.11+dfsg-1","1:4.0.14+dfsg-1","1:4.0.15+dfsg-1","1:4.0.16+dfsg-1","1:4.0.16+dfsg-1build1","1:4.0.17+dfsg-1","1:4.0.17+dfsg-1ubuntu0.1~esm1","1:4.0.17+dfsg-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"zabbix","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:5.0.8+dfsg-1build1","1:5.0.14+dfsg-1","1:5.0.17+dfsg-1","1:5.0.17+dfsg-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"zabbix","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:7.0.10+dfsg-2","1:7.0.10+dfsg-2build1"]}],"products":[{"vendor":"zabbix","product":"zabbix"}],"references":[{"url":"https://support.zabbix.com/browse/ZBX-27639","tags":["Vendor Advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23920"},{"url":"https://github.com/advisories/GHSA-2h5x-h7x4-hm9h"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-23920","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-23920","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-23920","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-23920","title":"Host and event action script regex validation can be bypassed in certain situations, leading to potential command injection","description":"Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.","status":"published","published":"2026-03-24T18:27:52.882Z","modified":"2026-03-26T03:55:29.372Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T13:42:04.39372Z"}],"euvd":[{"id":"EUVD-2026-14952","description":"Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.","status":"published","published":"2026-03-24T18:27:52Z","modified":"2026-03-26T03:55:29Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T19:25:28.569748Z"}],"ghsa":[{"id":"GHSA-2h5x-h7x4-hm9h","title":"Host and event action script input is validated with a regex (set by the administrator), but the...","description":"Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.","status":"published","published":"2026-03-24T21:31:23Z","modified":"2026-09-10T21:31:15Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T15:11:43.240477Z"}],"nvd":[{"id":"CVE-2026-23920","description":"Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.","status":"published","published":"2026-03-24T19:16:49.557Z","modified":"2026-09-10T21:15:39.95Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:12:10.568062Z"}],"osv":[{"id":"CVE-2026-23920","description":"Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.","status":"published","published":"2026-03-24T19:16:49.557Z","modified":"2026-10-24T14:58:38.343639272Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:59.079784Z"},{"id":"DEBIAN-CVE-2026-23920","description":"Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.","status":"published","published":"2026-03-24T19:16:49.557Z","modified":"2026-10-01T03:03:00.241229922Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:53.516942Z"},{"id":"UBUNTU-CVE-2026-23920","description":"Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.","status":"published","published":"2026-03-24T19:16:00Z","modified":"2026-09-14T11:17:31.53865691Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:04.456047Z"}]}}