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.
- Published Sep 8, 2026
- CVSS 6.3 medium
- 0.5% chance of exploitation in the next 30 days (EPSS)
- A fix is available