Input Validation Flaw in Zabbix Affects User Privileges
CVE-2026-23920

7.7HIGH

Key Information:

Vendor

Zabbix

Status
Zabbix
Vendor
CVE Published:
24 March 2026

What is CVE-2026-23920?

A vulnerability in Zabbix arises from the input validation mechanism for host and event action script settings that can be manipulated by authenticated users. When regex validators are implemented in multiline mode with the use of anchors (^ and $), an attacker could potentially inject newlines into the input. This allows for a bypass of the intended input validation, leading to the risk of executing arbitrary shell commands.

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Affected Version(s)

Zabbix 7.0.0 <= 7.0.21

Zabbix 7.2.0 <= 7.2.14

Zabbix 7.4.0 <= 7.4.5

References

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

CVSS V4

Score:
7.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Zabbix wants to thank YoKo Kho (@YoKoAcc) from PT ITSEC Asia, Tbk for submitting this report on the HackerOne bug bounty platform.
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