CVE-2026-18420
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| AWS | Amazon OpenSearch Service | 3.0.0 < 3.8.0 | affected |
| OpenSearch | OpenSearch Dashboards | 3.0.0 < 3.8.0 | affected |
Weaknesses
- CWE-1321: CWE-1321 Improperly controlled modification of object prototype attributes ('prototype pollution')
References
- 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
- https://aws.amazon.com/security/security-bulletins/2026-085-aws/
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