CVE-2026-18420

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.

CVSS Vector

References

• https://aws.amazon.com/security/security-bulletins/2026-085-aws/
• https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/3.8.0
• https://github.com/opensearch-project/OpenSearch-Dashboards/security/advisories/GHSA-xmqx-xq2p-8jq2