What’s Vulnerable › Vulnerabilities
CVE-2026-23920: Host and event action script regex validation can be bypassed in certain situations, leading to potential command injection
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-24 · updated 2026-09-10
- Weakness: CWE-78
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.
Affected products
- Zabbix: from 7.0.0 before 7.0.22; from 7.2.0 before 7.2.15; from 7.4.0 before 7.4.6 — fixed in 7.0.22, 7.2.15, 7.4.6
How to fix
Upgrade to a fixed version: Zabbix 7.0.22, 7.2.15, 7.4.6. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-23920 or the next vulnerability affects your stack