CVE-2026-23920: high-severity vulnerability in Zabbix
Host and event action script regex validation can be bypassed in certain situations, leading to potential command injection
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.7epss 0.3%
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.
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
Affected products
Zabbix · ZabbixRelated CVEs — Zabbix
In the same product, most dangerous first.
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