Is CVE-2026-84942 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-84942?

CVE-2026-84942 has a CVSS v3 severity of HIGH (8.7).

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CVE-2026-84942

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.