CVE-2026-28781
Medium · 6.5CVSS
6.5
EPSS
0.5%
Published
Mar 4, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Packagist | craftcms/cms | 4.0.0-RC1 | 4.17.0-beta.1 |
| Packagist | craftcms/cms | 5.0.0-RC1 | 5.9.0-beta.1 |
Related vulnerabilities
- GHSA-2xfc-g69j-x2mp Craft CMS: Entries Authorship Spoofing via Mass Assignment Same vulnerability
- GHSA-234q-vvw3-mrfq Craft CMS has unauthenticated activation email trigger with potential user enumeration Also affects craftcms/cms
- CVE-2026-29069 Craft is a content management system (CMS). Also affects craftcms/cms
- CVE-2026-28696 Craft is a content management system (CMS). Also affects craftcms/cms
- CVE-2026-28784 Craft is a content management system (CMS). Also affects craftcms/cms
- CVE-2026-28782 Craft is a content management system (CMS). Also affects craftcms/cms
- CVE-2026-28783 Craft is a content management system (CMS). Also affects craftcms/cms
- CVE-2026-28697 Craft is a content management system (CMS). Also affects craftcms/cms