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CVE

CVE-2026-28781

Craft Affected by Entries Authorship Spoofing via Mass Assignment
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CVE

CVE-2026-28781

Craft Affected by Entries Authorship Spoofing via Mass Assignment

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.1
-
4.0
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
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28781.json, https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp, https://nvd.nist.gov/vuln/detail/CVE-2026-28781, https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8, https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0.0005%
EPSS Percentile
0.16089%
Introduced Version
04755d93f86d07cc183db47db8a0eee106892e30,daac7c1da2f701f2e9ddee1da1457ce61660b581
Fix Available
0ad14c3c7e590461b52aeb44859659e2e231e04d,42cef196d68dd8d48ceaab89b2c9e2edd2cecbe8

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