Kibana 8.19.10, 9.1.10, 9.2.4 Security Update (ESA-2026-08)

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Improper Input Validation in Kibana Email Connector Leading to Excessive Allocation (ESA-2026-08)

Improper Input Validation (CWE-20) in Kibana's Email Connector can allow an attacker to cause an Excessive Allocation (CAPEC-130) through a specially crafted email address parameter. This requires an attacker to have authenticated access with view-level privileges sufficient to execute connector actions. The application attempts to process specially crafted email format, resulting in complete service unavailability for all users until manual restart is performed.

Affected Versions:

  • 7.x: All versions

  • 8.x: All versions from 8.0.0 up to and including 8.19.9

  • 9.x:

    • All versions from 9.0.0 up to and including 9.1.9

    • All versions from 9.2.0 up to and including 9.2.3

Solutions and Mitigations:

The issue is resolved in version 8.19.10, 9.1.10, 9.2.4.

Severity: CVSSv3.1: Medium (6.5) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVE ID: CVE-2026-0543

Problem Type: CWE-20 - Improper Input Validation

Impact: CAPEC-664 - Excessive Allocation

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