How severe is CVE-2026-23920?

CVE-2026-23920 has a CVSS 4.0 base score of 7.7, rated high severity.

Is CVE-2026-23920 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-23920?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-23920 have an EU (EUVD) identifier?

Yes. CVE-2026-23920 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14952.

When was CVE-2026-23920 published?

CVE-2026-23920 was published on 2026-03-24 and last updated on 2026-06-17.

CVE-2026-23920

CVE-2026-23920 is a high-severity vulnerability with a CVSS 4.0 base score of 7.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 4.0 base score 7.7)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-14952
Weakness: CWE-78
Published: 2026-03-24
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.
How severe is CVE-2026-23920?: CVE-2026-23920 has a CVSS 4.0 base score of 7.7, rated high severity.
Is CVE-2026-23920 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-23920?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-23920 have an EU (EUVD) identifier?: Yes. CVE-2026-23920 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14952.
When was CVE-2026-23920 published?: CVE-2026-23920 was published on 2026-03-24 and last updated on 2026-06-17.

References

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

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