CVE-2026-23920
Command Injection via Regex Bypass in Zabbix Host Action Scripts
Publication date: 2026-03-24
Last updated on: 2026-03-24
Assigner: Zabbix
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-78 | The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability occurs because the host and event action script input is validated using a regular expression that runs in multiline mode. When the validation uses the ^ and $ anchors, an injected newline character allows authenticated users to bypass the validation check and inject shell commands.
How can this vulnerability impact me? :
The vulnerability allows authenticated users to bypass input validation and inject shell commands. This can lead to unauthorized command execution on the affected system, potentially compromising system integrity, confidentiality, and availability.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know