Improperly Controlled Modification of Dynamically-Determined Object Attributes in Craft CMS - CVE-2026-28781
Published: June 16, 2026
Vulnerability identifier: #VU134652
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-28781
CWE-ID: CWE-915
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to spoof entry authorship.
The vulnerability exists due to improperly controlled modification of dynamically-determined object attributes in the entry creation process when handling crafted POST requests. A remote user can add the authorId or authorIds[] parameter to a request to spoof entry authorship.
Exploitation requires an account with permission to create entries and knowledge of the target user's account ID.
Affected software
Craft CMS
How to mitigate CVE-2026-28781
Install security update from vendor's website.
Craft CMS - addressed in versions 4.17.0, 5.9.0