CVE-2026-28781CWE-639CWE-915

Craft Affected by Entries Authorship Spoofing via Mass Assignment

High · published March 4, 2026

CVSS v4.0
7.1
EPSS
0%
Percentile
40.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.1 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00478 · 40.3th percentile
Weaknesses
CWE-639 · Authorization Bypass Through User-Controlled Key; CWE-915 · Improperly Controlled Modification of Dynamically-Determined Object Attributes
Published
2026-03-04T16:31Z
EPSS history
Timeline
  • 04 MAR 16:31Z
    Craft Affected by Entries Authorship Spoofing via Mass Assignment
    cvelistv5