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    CVE-2026-50136

    Budibase is an open-source low-code platform. Prior to 3.39.3, the application server exposes an unauthenticated endpoint that generates S3 PutObject presigned URLs using credentials stored in a workspace datasource. The route is protected only by the recaptcha middleware and does not require authentication, table permission, datasource permission, or builder access. A public caller who knows a workspace ID and S3 datasource ID can request a signed upload URL for attacker-controlled bucket and key values. This vulnerability is fixed in 3.39.3.

    Published:Jun 26, 2026
    Last Modified:Jun 27, 2026
    EPS:Jun 26, 2026
    EPSS Score:
    CVSS Score:7.4

    Affected Products

    Vendor
    Budibase
    Product
    Budibase

    Exploits

    https://github.com/Budibase/budibase/security/advisories/GHSA-jj36-r9w3-3pfhhttps://github.com/Budibase/budibase/security/advisories/GHSA-jj36-r9w3-3pfh

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    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