High severity8.8NVD Advisory· Published Aug 20, 2026

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Opensearch Project/OpenSearch Dashboardsllm-fuzzy
Range: before 3.8

Patches

Vulnerability mechanics

References

aws.amazon.com/security/security-bulletins/2026-085-aws/nvd
github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/3.8.0nvd
github.com/opensearch-project/OpenSearch-Dashboards/security/advisories/GHSA-xmqx-xq2p-8jq2nvd

News mentions

No linked articles in our index yet.

cvss	0.572
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000