Detections
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Elasticsearch 1.x / 3.x < 3.8.6 / 4.0.x < 4.2.1 (ESA-2026-215)

high Nessus Plugin ID 376453

Synopsis

The remote host is missing a security update.

Description

The version of Elasticsearch installed on the remote host is 1.x prior to 3.8.6, or 4.0.x prior to 4.2.1. It is, therefore, affected by a vulnerability as referenced in the ESA-2026-215 advisory.

 - Improper Link Resolution Before File Access ('Link Following') (CWE-59) in Elastic Cloud Enterprise (ECE) can lead to authentication bypass and unauthorized changes to the configuration of other deployments on the same host via Symlink Attack (CAPEC-132). (CVE-2026-115708)

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 3.8.6, or 4.2.1 or later as appropriate for your release branch.

See Also

https://discuss.elastic.co/t/391262

Plugin Details

Severity: High

ID: 376453

File Name: elasticsearch_esa_2026_215.nasl

Version: 1.1

Type: Combined

Agent: unix

Family: Misc.

Published: 11/5/2026

Updated: 11/5/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.8

Percentile: 58.14

CVSS v2

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 3.9

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

CVSS Score Source: CVE-2026-115708

CVSS v3

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

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

Required KB Items: installed_sw/Elasticsearch

Exploit Ease: No known exploits are available

Patch Publication Date: 10/29/2026

Vulnerability Publication Date: 10/29/2026

Reference Information

CVE: CVE-2026-115708