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OpenAdvisories
High · 8.8 CVE-2026-18420 EUVD-2026-63592GHSA-jhcc-gw3q-f4pc

RCE via Prototype Pollution in OpenSearch Dashboards

Published Aug 20, 2026 · Updated Aug 25, 2026 · Assigned by AMZN

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.

Affected products

VendorProductAffectedFixed
AWS Amazon OpenSearch Service 3.0.0 – < 3.8.0 3.8.0
OpenSearch OpenSearch Dashboards 3.0.0 – < 3.8.0 3.8.0

References