High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-23920
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:30 UTC · Revision 1
Source evidence
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.
osv:CVE-2026-23920
Complete source record
{
"id": "3a75cc3b1e851416424cc82457497018d1a1464f541120e741f5859112b096c0",
"url": "https://osv.dev/vulnerability/CVE-2026-23920",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-23920",
"summary": "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.",
"evidence": "osv:CVE-2026-23920",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-23920",
"aliases": [
"CVE-2026-23920"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/zabbix/zabbix",
"type": "GIT",
"events": [
{
"introduced": "49955f1fb5c9168a8a24b053f7ade6b3d903143c"
},
{
"fixed": "ba52e2ee4ff8768c8450819a772886d79dcde0b4"
},
{
"introduced": "372a4e93c48ecd25aa666949a055a02369031861"
},
{
"fixed": "626d2b8a4820a424efe8fd39df3b706468f1e5d4"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "7.0.0"
},
{
"fixed": "7.0.22"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "7.4.0"
},
{
"fixed": "7.4.6"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"7.0.22rc3",
"7.4.6rc2",
"7.4.6rc1",
"7.0.22rc2",
"7.0.22rc1",
"7.0.20",
"7.0.21",
"7.4.5",
"7.4.4",
"7.0.20rc1",
"7.4.4rc1",
"7.0.19",
"7.4.3",
"7.4.3rc1",
"7.0.19rc1",
"7.4.2",
"7.0.18",
"7.0.18rc2",
"7.4.2rc2",
"7.0.18rc1",
"7.4.2rc1",
"7.4.1",
"7.0.17",
"7.4.1rc1",
"7.0.17rc2",
"7.0.17rc1",
"7.0.16",
"7.0.15",
"7.4.0",
"7.0.14",
"7.0.14rc1",
"7.0.13",
"7.0.13rc1",
"7.0.12",
"7.0.12rc1",
"7.0.11",
"7.0.11rc2",
"7.0.11rc1",
"7.0.10",
"7.0.10rc1",
"7.0.9",
"7.0.9rc2",
"7.0.9rc1",
"7.0.8",
"7.0.8rc2",
"7.0.8rc1",
"7.0.7",
"7.0.7rc1",
"7.0.6",
"7.0.6rc1",
"7.0.5",
"7.0.5rc1",
"7.0.4",
"7.0.4rc1",
"7.0.3",
"7.0.3rc1",
"7.0.2",
"7.0.2rc2",
"7.0.2rc1",
"7.0.1",
"7.0.1rc2",
"7.0.1rc1",
"7.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23920.json",
"vanir_signatures": [
{
"id": "CVE-2026-23920-6d3c1d38",
"digest": {
"threshold": 0.9,
"line_hashes": [
"335575185657139336988338025089072345512",
"144097728509264372924349761206701036791",
"185724688006201679055704973376898360796",
"130162026250320242787979560813111933511",
"70354792077183199662061649065794713982",
"152321436213664381476643075846246568564"
]
},
"source": "https://github.com/zabbix/zabbix/commit/626d2b8a4820a424efe8fd39df3b706468f1e5d4",
"target": {
"file": "src/zabbix_java/src/com/zabbix/gateway/GeneralInformation.java"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2026-23920-8066b192",
"digest": {
"threshold": 0.9,
"line_hashes": [
"335575185657139336988338025089072345512",
"144097728509264372924349761206701036791",
"265387215296323665047876836033014923187",
"72110328909359773811350994976134420490",
"245919019046659487345219626549275780890",
"41189996272314509887159037345751552815"
]
},
"source": "https://github.com/zabbix/zabbix/commit/ba52e2ee4ff8768c8450819a772886d79dcde0b4",
"target": {
"file": "src/zabbix_java/src/com/zabbix/gateway/GeneralInformation.java"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-24T14:58:38Z"
}
}
],
"modified": "2026-10-24T14:58:38.343639272Z",
"provider": "osv",
"references": [
"https://support.zabbix.com/browse/ZBX-27639"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*"
],
"vendor_product": "zabbix:zabbix",
"extracted_events": [
{
"range": [
{
"introduced": "7.2.0"
},
{
"fixed": "7.2.15"
}
],
"source": "CPE_RANGE"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2026-23920",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 443904,
"published_at": "2026-03-24T19:16:49.557+00:00"
}