Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.
VOLERION
Volerion Security Research

NOT DEFERRED DATABASE

VULNERABILITIES

CVE-2026-18420 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: AMZNCVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://aws.amazon.com/security/security-bulletins/2026-085-aws/ AMZN
https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/3.8.0 AMZN
https://github.com/opensearch-project/OpenSearch-Dashboards/security/advisories/GHSA-xmqx-xq2p-8jq2 AMZN

Weakness Enumeration

CWE-IDCWE NameSource
CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')AMZN

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-18420
NVD Published Date:
Aug 20, 2026
NVD Last Modified:
Aug 25, 2026
Source:
AMZN
CVE-2026-18420 Details - Not Deferred