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CVE-2026-28781

Craft Affected by Entries Authorship Spoofing via Mass Assignment

Published: Mar 4, 2026Updated: Mar 5, 2026 Sources: CVE List NVD GHSACWE-639
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 75.8%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-639CWE-915

Affected Products

cmscraftcmsWeb & CMS Plugins
craft cmscraftcmsWeb & CMS Plugins
craftcms/cmsPackagistOSS Libraries
craftcmscommercialNZWeb & CMS Plugins
packagistpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
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References

https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp
github.com
https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8
github.com
https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542
github.com
and 2 more references View all →

Timeline

Published
Mar 4, 2026
Last Updated
Mar 5, 2026

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