CVE-2026-23920Network attack vectorHinoki check available

Authenticated command injection via multiline regex bypass

Published Mar 24, 2026 · Updated Mar 24, 2026

OS command injection in Zabbix Server and Proxy allows remote authenticated users to execute shell commands through action script input. Administrator-defined host and event action-script regular expressions run in multiline mode, so a newline can make anchored validation accept additional command text. Exploitation requires authenticated access and a validation expression using ^ or $; affected releases are 7.0.0 through 7.0.21, 7.2.0 through 7.2.14, and 7.4.0 through 7.4.5.

CVSS severity7.7
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

OS command injection in Zabbix Server and Proxy allows remote authenticated users to execute shell commands through action script input. Administrator-defined host and event action-script regular expressions run in multiline mode, so a newline can make anchored validation accept additional command text. Exploitation requires authenticated access and a validation expression using ^ or $; affected releases are 7.0.0 through 7.0.21, 7.2.0 through 7.2.14, and 7.4.0 through 7.4.5.

The record

CVE
CVE-2026-23920
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Zabbix
Product
Zabbix
Classifications
CWE-78, CAPEC-88, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.0.0 <=7.0.21 changes=[{"at":"7.0.22","status":"unaffected"}]
  2. Affected versionversion=7.2.0 <=7.2.14 changes=[{"at":"7.2.15","status":"unaffected"}]
  3. Affected versionversion=7.4.0 <=7.4.5 changes=[{"at":"7.4.6","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zabbix · Zabbixversion=7.0.0 <=7.0.21 changes=[{"at":"7.0.22","status":"unaffected"}]; version=7.2.0 <=7.2.14 changes=[{"at":"7.2.15","status":"unaffected"}]; version=7.4.0 <=7.4.5 changes=[{"at":"7.4.6","status":"unaffected"}]

Published CVSS scores

7.7ZabbixCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CAPEC-88OS Command Injection
T1059.004Unix Shell

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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