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    CVE-2026-28781

    Craft is a content management system (CMS). Prior to 4.17.0-beta.1 and 5.9.0-beta.1, the entry creation process allows for Mass Assignment of the authorId attribute. A user with "Create Entries" permission can inject the authorIds[] (or authorId) parameter into the POST request, which the backend processes without verifying if the current user is authorized to assign authorship to others. Normally, this field is not present in the request for users without the necessary permissions. By manually adding this parameter, an attacker can attribute the new entry to any user, including Admins. This effectively "spoofs" the authorship. This vulnerability is fixed in 4.17.0-beta.1 and 5.9.0-beta.1.

    Published:Mar 4, 2026
    Last Modified:Apr 17, 2026
    EPS:Mar 4, 2026
    EPSS Score:0.00043
    CVSS Score:6.5

    Affected Products

    Vendor
    Craftcms
    Product
    Craft Cms
    Vendor
    Craftcms
    Product
    Craftcms

    Exploits

    https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp

    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