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Vulnerabilities CVE-2026-18420

CVE-2026-18420

High
Open
TLP:CLEAR

RCE via Prototype Pollution in OpenSearch Dashboards

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Description

Improper input validation in the Time Series Visual Builder (TSVB) plugin in OpenSearch Dashboards allows an authenticated remote user to execute arbitrary code on the server via a crafted JSON payload to the metrics visualization API endpoint. This issue is a form of prototype pollution that enables remote code execution.  To remediate this issue, users should upgrade to OpenSearch Dashboards 3.8 or later.

Details

CVSS Score
8.8
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Confidence
90%
Published
Aug 20, 2026
Last Modified
Aug 20, 2026
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