Kibana 8.x < 8.19.16 / 9.0.x < 9.3.5 / 9.4.x < 9.4.2 Multiple Vulnerabilities (ESA-2026-35 / ESA-2026-38)

medium Nessus Plugin ID 318724

Synopsis

The remote host is affected by multiple vulnerabilities.

Description

The version of Kibana installed on the remote host is prior to 8.19.16, 9.3.5, or 9.4.2. It is, therefore, affected by multiple vulnerabilities as referenced in the ESA-2026-35 and ESA-2026-38 advisories.

- Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user can send a specially crafted compressed request payload that is processed prior to authorization checks, causing excessive memory and CPU resource consumption that can result in a Kibana instance becoming unresponsive or crashing. (CVE-2026-42400)

- Improper Input Validation (CWE-20) in the Kibana Fleet agent policy management feature can lead to privilege escalation. An authenticated user with Fleet management privileges can manipulate agent policy configuration by injecting values into a configuration override mechanism that is not adequately validated. An attacker can cause Elastic Agents to be issued API keys with elevated Elasticsearch privileges, potentially granting unauthorized read and write access to sensitive Elasticsearch security indices beyond what is intended for the Fleet management role. (CVE-2026-49095)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update to Kibana version 8.19.16, 9.3.5, 9.4.2 or later.

Plugin Details

Severity: Medium

ID: 318724

File Name: kibana_esa_2026_35.nasl

Version: 1.1

Type: Remote

Family: CGI abuses

Published: 6/4/2026

Updated: 6/4/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.7

Vector: CVSS2#AV:N/AC:L/Au:M/C:C/I:C/A:N

CVSS Score Source: CVE-2026-49095

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Vulnerability Information

CPE: cpe:/a:elasticsearch:kibana

Required KB Items: installed_sw/Kibana

Patch Publication Date: 5/28/2026

Vulnerability Publication Date: 5/28/2026

Reference Information

CVE: CVE-2026-42400, CVE-2026-49095

Detections

Analytics