CVE intelligence

CVE-2026-84942

Vulnerability intelligence

Published Sep 8, 2026Sources checked Oct 27, 2026

8.7HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-84942 and is rated High severity with a CVSS score of 8.7. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

AWS Security Bulletins guidance

Vendor revision: Oct 25, 2026

Vendor remediation details

Affedted products & versions: OpenSearch Dashboards (open-source, self-managed): - Affected: v2.0.0, v2.1.0, v2.2.0, v2.3.0, v2.4.0, v2.5.0, v.2.6.0, v2.7.0, v2.8.0, v2.9.0, v2.10.0, v2.11.0, v2.12.0, v2.13.0, v2.14.0, v2.15.0, v2.16.0, v2.17.0, v2.18.0, v2.19.0, v3.0.0, v3.1.0, v3.2.0, v3.3.0, v3.4.0, v3.5.0 - Fixed: v2.19.5 and v3.6.0 Amazon OpenSearch Service (AWS Managed): - Affected: v2.3.0, v2.5.0, v2.7.0, v2.9.0, v2.11.0, v2.13.0, v2.15.0, v2.17.0, v2.19.0, v3.1.0, v3.3.0, v3.5.0 - Fixed: v2.3.0, v2.5.0, v2.7.0, v2.9.0, v2.11.0, v2.13.0, v2.15.0, v2.17.0, v2.19.0 and v3.1.0, v3.3.0, v3.5.0 Amazon OpenSearch Serverless: - Not affected Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

CISA KEVNot listedBased on the latest collected catalog

EPSS0.5%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-84942?

Improper input validation in the Vega expression function implementation in OpenSearch Dashboards allows a remote authenticated actor with dashboard write permissions to execute arbitrary JavaScript in the context of other users' browser sessions by saving a crafted Vega visualization.

The checkForFunctionProperty validation routine failed to recurse into arrays of objects, allowing a function property nested inside an array to bypass validation.

Source: NVD