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Vulnerability details

CVE-2026-28781

craftcms cms

Craft Affected by Entries Authorship Spoofing via Mass Assignment

CVSS 4.0
7.1High

Official 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 scores

ScoreVersionSourceVector
7.1High 4.0 CVEProject cvelistV5 (CNA) (GitHub_M) 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

Affected products

VendorProductVersionsSource
craftcms cms >= 4.0.0-RC1, < 4.17.0-beta.1 CVEProject cvelistV5 (CNA)
craftcms cms >= 5.0.0-RC1, < 5.9.0-beta.1 CVEProject cvelistV5 (CNA)

References and advisories

3
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Details

Published
2026-03-04
Last updated
2026-03-04
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.38%
Probability of exploitation in 30 days
33%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Proof of concept
Technical impact
Partial

Weaknesses (CWE)

  • CWE-639
    Authorization Bypass Through User-Controlled Key
  • CWE-915
    Improperly Controlled Modification of Dynamically-Determined Object Attributes