CVE-2026-23920

A flaw was found in Zabbix. Authenticated users can bypass input validation in host and event action scripts by injecting a newline character. This bypass occurs because the validation regex, which uses start-of-line ^ and end-of-line $ anchors, operates in multiline mode. Successful exploitation...

CVE-2026-23920 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...