Host and event action script regex validation can be bypassed in certain situations, leading to potential command injection_CVE-2026-23920

{
    "lastseen": "",
    "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.",
    "published": "2026-03-24T18:27:52.882Z",
    "modified": "2026-03-26T03:55:29.372Z",
    "type": "cve",
    "title": "Host and event action script regex validation can be bypassed in certain situations, leading to potential command injection",
    "source": "Zabbix",
    "references": "https://support.zabbix.com/browse/ZBX-27639",
    "id": "CVE-2026-23920",
    "bulletinFamily": "",
    "cwe": [
        "CWE-78"
    ],
    "cvelist": null,
    "sourceData": "Zabbix Zabbix 7.0.0\nZabbix Zabbix 7.2.0\nZabbix Zabbix 7.4.0",
    "sourceHref": "",
    "cvss": {
        "score": 7.7,
        "severity": "HIGH",
        "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Zabbix",
    "version": "7.0.0",
    "vendor": "Zabbix",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}