CVE-2026-28781

HIGH EPSS 24.4%
Published Mar 4, 20263mo ago · Modified Jun 17, 20261w ago
7.1 CVSS 4.0
High
Find Similar
Published Mar 4, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.1
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
24.4% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-639
CWE-915

Affected Products 8

VendorProductVersionRange
craftcmscraft_cms*>4.0.0  –  <4.17.0
craftcmscraft_cms*>5.0.0  –  <5.9.0
craftcmscraft_cms4.0.0any
craftcmscraft_cms4.0.0any
craftcmscraft_cms4.0.0any
craftcmscraft_cms4.0.0any
craftcmscraft_cms5.0.0any
craftcmscraft_cms5.0.0any

References 3

  • github.com https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8
    Patch
  • github.com https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542
    Patch
  • github.com https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp
    ExploitPatchVendor Advisory

Remediation

  • github.com https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8
    Patch
  • github.com https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542
    Patch
  • github.com https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp
    ExploitPatchVendor Advisory