CVE-2026-23920

Host and event action script regex validation can be bypassed in certain situations, leading to potential command injection

State: Published
Severity: 7.7 High
Published: Mar 24, 2026
Updated: Mar 26, 2026
Reserved: Jan 19, 2026

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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.

Scores

CVSS	Score	Vector	Source
4.0	7.7 High	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	Zabbix

Weaknesses

CWE-78 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Affected Products

Product	Versions
ZabbixZabbix	7.0.0 through 7.0.21Affectedfrom 7.0.22Not affected 7.2.0 through 7.2.14Affectedfrom 7.2.15Not affected 7.4.0 through 7.4.5Affectedfrom 7.4.6Not affected

References

https://support.zabbix.com/browse/ZBX-27639

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