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Vulnerabilities

Vulnerability · CVE-2026-23920

Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode.

Published Mar 24, 2026 · catalog updated Sep 10, 2026 · Host and event action

Check if you run it

No confirmed exploitation is on record for CVE-2026-23920. EPSS is 0.30%. Act only if a listed version of Host and event action is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Host and event action).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.30%
Remediation
Advisory link
Affected products
cpe zabbix/zabbix

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe zabbix/zabbixversion unspecified

How to fix CVE-2026-23920

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-23920. EPSS is 0.30%. Act only if a listed version of Host and event action is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-78: OS Command Injection. EPSS 0.30%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 24, 2026 · NIST NVD

    Detected

    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.

  2. Sep 10, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-23920

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-23920

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-23920

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.