HIGH 8.7 NVD
CVE-2026-18420
Improper input validation in the Time Series Visual Builder (TSVB) plugin in OpenSearch Dashboards allows an authenticated remote user to execute arbitrary code
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.
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-
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-08-20 via NVD.
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