Zabbix Script Regex Injection via Multiline Mode
CVE-2026-23920 Published on March 24, 2026
Host and event action script regex validation can be bypassed in certain situations, leading to potential command injection
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.
Weakness Type
What is a Shell injection Vulnerability?
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CVE-2026-23920 has been classified to as a Shell injection vulnerability or weakness.
Products Associated with CVE-2026-23920
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Affected Versions
Zabbix:- Version 7.0.0, <= 7.0.21 is affected.
- Version 7.2.0, <= 7.2.14 is affected.
- Version 7.4.0, <= 7.4.5 is affected.