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PatchSiren cyber security CVE debrief

CVE-2026-23938 Zabbix CVE debrief

An authenticated administrator can crash the Zabbix server or proxy by creating specifically crafted preprocessing/script item JavaScript scripts, potentially leading to a denial of service. This issue affects Zabbix versions 6.0.0 to 6.0.47, 7.0.0 to 7.0.27, and 7.4.0 to 7.4.11. The vulnerability allows an authenticated administrator with access to create preprocessing/script item JavaScript scripts to crash the Zabbix server or proxy, which could lead to a denial of service. To mitigate this vulnerability, it is essential to verify and update Zabbix server and proxy instances to the latest patched versions.

Vendor
Zabbix
Product
Unknown
CVSS
LOW 2.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-18
Original CVE updated
2026-09-23
Advisory published
2026-08-18
Advisory updated
2026-09-23

Who should care

Zabbix administrators and personnel with access to create preprocessing/script item JavaScript scripts should verify and update their instances to the latest patched versions to prevent potential denial of service attempts.

Why it matters

Defenders should prioritize verifying and updating Zabbix server and proxy instances to the latest patched versions, especially for administrators with access to create preprocessing/script item JavaScript scripts, to prevent potential denial of service attempts.

  • Potential denial of service for Zabbix server or proxy instances.
  • Verification of Zabbix server and proxy versions and updates to patched versions is required.

Technical summary

An authenticated administrator can crash the Zabbix server or proxy by creating specifically crafted preprocessing/script item JavaScript scripts. This issue affects Zabbix versions 6.0.0 to 6.0.47, 7.0.0 to 7.0.27, and 7.4.0 to 7.4.11. The vulnerability is caused by the lack of proper validation of user-supplied input in the preprocessing/script item JavaScript scripts. To prevent potential denial of service attempts, it is crucial to restrict access to create preprocessing/script item JavaScript scripts to only necessary personnel and monitor Zabbix server and

Defensive priority

Defenders should prioritize verifying and updating Zabbix server and proxy instances to the latest patched versions, especially for administrators with access to create preprocessing/script item JavaScript scripts.

Recommended defensive actions

  • Verify and update Zabbix server and proxy instances to the latest patched versions.
  • Restrict access to create preprocessing/script item JavaScript scripts to only necessary personnel.
  • Monitor Zabbix server and proxy logs for potential denial of service attempts.

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, its CVSS score, and affected versions. A vendor advisory is available from Zabbix.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-23938 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-23938

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-23938 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-23938

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.