CVE-2026-23920 Command injection in Zabbix
Authenticated users can bypass regex validation in Zabbix host and event action scripts to inject shell commands, leading to remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23920?
CVE-2026-23920 is a high-severity command injection vulnerability in Zabbix Zabbix, published on 24 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-78
Which versions are affected by CVE-2026-23920?
It affects 1 product.
Products include Zabbix Zabbix.
How do I fix CVE-2026-23920?
Apply the vendor's patch.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-23920 being exploited?
There is no known exploitation of CVE-2026-23920 in the wild and no public exploit code.
Other vulnerabilities in Zabbix Zabbix
Sources
Also known as DEBIAN-CVE-2026-23920, GHSA-2h5x-h7x4-hm9h, UBUNTU-CVE-2026-23920.