CVE-2026-84942
HIGH
NVD
CVSS Score
8.7
Severity
HIGH
Published
Sep 08, 2026
Vendor
unknown
Description
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.