SB2026061667 - Improper access control in Craft CMS

Description

This security bulletin contains information about 1 vulnerability.

1) Improper access control (CVE-ID: CVE-2026-32267)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote user to escalate privileges.

The vulnerability exists due to improper access control in UsersController->actionImpersonateWithToken() when handling a crafted request that re-dispatches from a preview URL with a valid token. A remote user can append crafted action and user parameters to a valid preview URL to escalate privileges.

The issue can also be exploited by an unauthenticated user who has been sent a shared preview URL containing a valid token.

Remediation

Install update from vendor's website.

References

• https://github.com/craftcms/cms/security/advisories/GHSA-cc7p-2j3x-x7xf
• https://github.com/craftcms/cms/commit/6301e217c5f15617d939c432cb770db50af14b33