CVE-2026-84942
Stored Cross-Site Scripting via Vega Expression Function Bypass in OpenSearch Dashboards
CVSS Score
8.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | aws |
| Product | amazon opensearch service |
| Published | Sep 8, 2026 |
| Last Updated | Sep 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
AWS / Amazon OpenSearch Service
All versions affected OpenSearch / OpenSearch Dashboards
v2.0.0 ≤ v3.5.0