CVE-2026-84942 — Stored Cross-Site Scripting via Vega Expression Function Bypass in OpenSearch Dashboards
Improper input validation in the Vega expression function implementation in OpenSearch Dashboards allows a remote authenticated actor with dashboard write permissions to execute…
Published: 2026-09-08 · CVSS: 6.3 · CVSS 4.0
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: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7