Detections
Analytics

Elasticsearch 7.17.5 / 17.17.29 / 8.2.2 < 8.19.19 / 9.x < 9.3.8 / 9.4.x < 9.4.4 Incorrect Authorization (ESA-2026-188)

medium Nessus Plugin ID 364385

Synopsis

The remote host is missing a security update.

Description

The version of Elasticsearch installed on the remote host is prior to 8.19.19, 9.3.8, 9.4.4. It is, therefore, affected by a vulnerability as referenced in the ESA-2026-188 advisory.

 - Incorrect Authorization (CWE-863) in Elasticsearch can lead to unauthorized data stream modification via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). An authenticated user with sufficient privileges over a single resource could use the Modify Data Streams API to modify a data stream to which they were not otherwise authorized, potentially injecting data into it or affecting its ability to be searched normally. This issue does not allow an attacker to read the contents of a data stream they do not otherwise have access to. (CVE-2026-102407)

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

Solution

Upgrade to Elasticsearch version 8.19.19, 9.3.8, or 9.4.4 or later as appropriate for your release branch.

See Also

https://discuss.elastic.co/t/390861

Plugin Details

Severity: Medium

ID: 364385

File Name: elasticsearch_esa_2026_188.nasl

Version: 1.2

Type: Combined

Agent: unix

Family: Misc.

Published: 10/9/2026

Updated: 10/9/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.1

Percentile: 53.42

CVSS v2

Risk Factor: Medium

Base Score: 5.5

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

CVSS Score Source: CVE-2026-102407

CVSS v3

Risk Factor: Medium

Base Score: 5.4

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

Vulnerability Information

CPE: cpe:/a:elastic:elasticsearch, cpe:/a:elasticsearch:elasticsearch

Required KB Items: installed_sw/Elasticsearch

Patch Publication Date: 10/6/2026

Vulnerability Publication Date: 10/6/2026

Reference Information

CVE: CVE-2026-102407

IAVA: 2026-A-1094