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CVE-2026-56151

Improper Input Validation in Kibana Leading to Denial of Service

MEDIUM
6.5
CVSS Score
Published: July 1, 2026 at 04:29 PM UTC
Updated: October 25, 2026 at 05:10 PM UTC
1 product affected across 1 vendorKibana

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Kibana· Elasticsearch
95%
8.0.0 ≤ v < 8.19.179.0.0 ≤ v < 9.3.69.4.0 ≤ v < 9.4.38.0.09.0.09.4.0
Affected range stops below 8.19.17, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.3.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.4.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMelastic
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-20

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