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.

Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-2xfc-g69j-x2mp Craft CMS: Entries Authorship Spoofing via Mass Assignment
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 04 Mar 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 04 Mar 2026 16:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Craft Affected by Entries Authorship Spoofing via Mass Assignment
Weaknesses CWE-639
CWE-915
References
Metrics cvssV4_0

{'score': 7.1, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-04T17:36:52.722Z

Reserved: 2026-03-03T14:25:19.244Z

Link: CVE-2026-28781

cve-icon Vulnrichment

Updated: 2026-03-04T17:36:48.255Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-04T17:16:21.370

Modified: 2026-03-04T18:08:05.730

Link: CVE-2026-28781

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses