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    CVE-2026-42239

    Budibase is an open-source low-code platform. Prior to version 3.35.10, the budibase:auth cookie containing the JWT session token is set with httpOnly: false at packages/backend-core/src/utils/utils.ts:218. JavaScript can read this cookie via document.cookie. This means every XSS becomes a full account takeover — the attacker steals the JWT and has persistent access to the victim's account. The cookie also lacks secure: true (sent over plaintext HTTP) and sameSite attribute. This issue has been patched in version 3.35.10.

    Published:May 7, 2026
    Last Modified:Jun 4, 2026
    EPS:May 7, 2026
    EPSS Score:0.00028
    CVSS Score:8.1

    Affected Products

    Vendor
    Budibase
    Product
    Budibase

    Exploits

    https://github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642rhttps://github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642r

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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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