CVE-2026-84942
8.7
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| AWS | Amazon OpenSearch Service | v2.3.0 <= v3.5.0 | unaffected |
| OpenSearch | OpenSearch Dashboards | v2.0.0 <= v3.5.0 | affected |
Weaknesses
- CWE-79: CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')
References
- https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/3.6.0
- https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/2.19.5
- https://aws.amazon.com/security/security-bulletins/2026-102-aws/
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