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AWS Security BulletinsCVE-2026-18420

CVE-2026-18420 - Remote Code Execution via Prototype Pollution in OpenSearch Dashboards TSVB Plugin

Bulletin ID: 2026-085-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 08/20/2026 13:30 PM PDT Description: Improper input validation in the Time Series Visual Builder (TSVB) plugin in OpenSearch Dashboards before 3.8 allows a remote authenticated user with standard data access permissions to execute arbitrary code on the server by sending a crafted JSON payload to the metrics visualization API endpoint. To mitigate this issue, users should upgrade to OpenSearch Dashboards 3.8 or later. Impacted products and versions: - OpenSearch-Dashboards (open-source, self-managed): >=3.0.0, =3.0.0,

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Scope

What the vendor says is affected

The collected bulletin did not provide a separate affected-products list. Check the original bulletin before making an exposure decision.

Next step

What the vendor recommends

To mitigate this issue, users should upgrade to OpenSearch Dashboards 3.8 or later.

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Update history

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    • The vendor changed the advisory's last-updated date.
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  2. Published by AWS

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  3. Confirmed at the source

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Vulnerabilities

CVEs named in this advisory

CVE-2026-18420View CVSS, KEV, EPSS, and threat context
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