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CVE-2026-28781 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8	[email protected]	Patch
https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542	[email protected]	Patch
https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp	[email protected]	ExploitPatchVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-639	Authorization Bypass Through User-Controlled Key	[email protected]
CWE-915	Improperly Controlled Modification of Dynamically-Determined Object Attributes	[email protected]

Affected Products

Product	Versions
craftcms craft cms	> 4.0.0, < 4.17.0 > 5.0.0, < 5.9.0 4.0.0 - 4.0.0 rc1 4.0.0 rc2
CPE cpe:2.3:a:craftcms:craft_cms:::::::: cpe:2.3:a:craftcms:craft_cms:4.0.0:-:::::: cpe:2.3:a:craftcms:craft_cms:4.0.0:rc1:::::: cpe:2.3:a:craftcms:craft_cms:4.0.0:rc2:::::: cpe:2.3:a:craftcms:craft_cms:4.0.0:rc3:::::: cpe:2.3:a:craftcms:craft_cms:5.0.0:-:::::: cpe:2.3:a:craftcms:craft_cms:5.0.0:rc1:::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Mar 5, 2026	Initial Analysis	[email protected]
Mar 4, 2026	New CVE Received	[email protected]