Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Craftcms | Craft Cms | < 4.17.0 |
Related Weaknesses (CWE)
References
- https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8Patch
- https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542Patch
- https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mpExploitPatchVendor Advisory
FAQ
What is CVE-2026-28781?
CVE-2026-28781 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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" permi...
How severe is CVE-2026-28781?
CVE-2026-28781 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-28781?
Check the references section above for vendor advisories and patch information. Affected products include: Craftcms Craft Cms.