High 7.1Published Mar 4, 2026

CVE-2026-28781Craft Affected by Entries Authorship Spoofing via Mass Assignment

Updated under an hour ago (Oct 26, 2026, 10:20 PM ET)

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It affects craftcms cms and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for craftcms cms

Exploited in the last 30 days

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: 7.1 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-639, CWE-915
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 4, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

craftcms cms craftcms:cms (from the name)	from 5.0.0-RC1, < 5.9.0-beta.1; from 4.0.0-RC1, < 4.17.0-beta.1	CNA record
craftcms craft_cms craftcms:craft_cms	after 4.0.0 before 4.17.0; after 5.0.0 before 5.9.0; 4.0.0; 4.0.0; 4.0.0; 4.0.0; 5.0.0; 5.0.0	NVD

References

References

https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp	x-refsource-confirm, exploit, patch, vendor-advisory
https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8	x-refsource-misc, patch
https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.