CVE-2026-23920 Details
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.
A command injection vulnerability has been identified in Zabbix's host and event action script input validation. The validation, which is controlled by the administrator through regex, operates in multiline mode. This allows authenticated users to inject newlines, bypassing the regex anchors and injecting shell commands. This issue affects Zabbix versions 7.0.0 to 7.0.21, 7.2.0 to 7.2.14, and 7.4.0 to 7.4.5.
Users can update to Zabbix version 7.0.22, 7.2.15, or 7.4.6, depending on their current version. Additionally, as a temporary workaround, regex validations can be adjusted to use \A and \z anchors instead of ^ and $.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 25, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://support.zabbix.com/browse/ZBX-27639 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-78 | Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| zabbix zabbix | >= 7.0.0, < 7.0.22 >= 7.2.0, < 7.2.15 >= 7.4.0, < 7.4.6 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 10, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 24, 2026 | New CVE Received | [email protected] |