CVE-2026-56151

Improper Input Validation in Kibana Leading to Denial of Service

State: Published
Severity: 6.5 Medium
Published: Jul 1, 2026
Updated: Jul 1, 2026
Reserved: Jun 19, 2026

Description

Improper Input Validation (CWE-20) in Kibana can lead to a denial of service via Input Data Manipulation (CAPEC-153). An authenticated user can submit a specially crafted Fleet policy input that is not correctly validated, which can render Fleet agent, server, and policy management functionality unavailable.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	elastic

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
KibanaElastic	9.0.0 through 9.3.5Affected 8.0.0 through 8.19.16Affected 9.4.0 through 9.4.2Affected

References

https://discuss.elastic.co/t/kibana-8-19-17-9-3-6-9-4-3-security-update-esa-2026-45

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