CVE-2026-84942
Stored Cross-Site Scripting via Vega Expression Function Bypass in OpenSearch Dashboards
- State
- Published
- Severity
- 6.3 Medium
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Reserved
- Sep 2, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N | AMZN |
| 3.1 | 8.7 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N | AMZN |
Weaknesses
- CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')
Affected Products
| Product | Versions |
|---|---|
Amazon OpenSearch ServiceAWS |
|
OpenSearch DashboardsOpenSearch |
|
References
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