CVE-2026-84942

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    CVE-2026-84942

    Published: 8 Sept 2026Last Modified: 11 Sept 2026

    Summary: Stored Cross-Site Scripting via Vega Expression Function Bypass in OpenSearch Dashboards

    Details: 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.

    References: https://aws.amazon.com/security/security-bulletins/2026-102-aws/, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84942.json, https://nvd.nist.gov/vuln/detail/CVE-2026-84942, https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/2.19.5, https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/3.6.0

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 3d6dd638d021f383a4c6ab750c83a1d30d3787b3
    Fixed -bc90b6a50a0989323442aba09ffd2ff270d5340f

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-84942 | CVE-DB