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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact High

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
AWS Amazon OpenSearch Service unaffected
Version Status Constraints
v2.3.0 unaffected ≤ v3.5.0
OpenSearch OpenSearch Dashboards unaffected
Version Status Constraints
v2.0.0 affected ≤ v3.5.0

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Aws Subscribe
Amazon Opensearch Service Subscribe
Opensearch Subscribe
Opensearch Dashboards Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://aws.amazon.com/security/security-bulletins/2026-102-aws/ cve-icon cve-icon
https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/2.19.5 cve-icon cve-icon
https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/3.6.0 cve-icon cve-icon
History

Tue, 08 Sep 2026 20:00:00 +0000

Type Values Removed Values Added
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.
Title Stored Cross-Site Scripting via Vega Expression Function Bypass in OpenSearch Dashboards
First Time appeared Aws
Aws amazon Opensearch Service
Opensearch
Opensearch opensearch Dashboards
Weaknesses CWE-79
CPEs cpe:2.3:a:aws:amazon_opensearch_service:*:*:*:*:*:*:*:*
cpe:2.3:a:opensearch:opensearch_dashboards:*:*:*:*:*:*:*:*
Vendors & Products Aws
Aws amazon Opensearch Service
Opensearch
Opensearch opensearch Dashboards
References
Metrics cvssV3_1

{'score': 8.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N'}

cvssV4_0

{'score': 6.3, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-09-08T19:41:25.224Z

Reserved: 2026-09-02T16:47:56.353Z

Link: CVE-2026-84942

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-08T20:18:51.307

Modified: 2026-09-08T20:18:51.307

Link: CVE-2026-84942

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses