EUVD-2026-276463

fkie_cve-2026-32267

Craft CMS is a content management system (CMS). From version 4.0.0-RC1 to before version 4.17.6 and from version 5.0.0-RC1 to before version 5.9.12, a low-privilege user (or an unauthenticated user who has been sent a shared URL) can escalate their privileges to admin by abusing UsersController->actionImpersonateWithToken. This issue has been patched in versions 4.17.6 and 5.9.12.

GHSA-cc7p-2j3x-x7xf — Craft CMS Vulnerable to Privilege Escalation/Bypass through UsersController->actionImpersonateWithToken()

Affected: Packagist: craftcms/cms

### Summary A low-privilege user (or an unauthenticated user who has been sent a shared URL) can escalate their privileges to admin by abusing `UsersController->actionImpersonateWithToken`.

Affected users should update to Craft 4.17.6 and 5.9.12 to mitigate the issue.

### Details This vulnerability allows any low-privilege user to escalate their privileges and become an admin, or, in extreme circumstances, unprivileged users to do the same.

Therefore, this vulnerability affects Craft Pro and Team more than Craft Solo.

Specifically, an attacker who possesses a valid “preview token” can then append `&action=users/impersonate-with-token&userId=1&prevUserId=1` to the preview URL to hijack the request into the impersonation endpoint, logging in as any user (including admin) without authentication. Getting the preview token is easy, and all an editor would have to do is create a single article, click “Preview”, and then recover this token.

Here’s what happens:

1. The action re-dispatch in `actionPreview()` passes `$skipSpecialHandling=true` to `handleRequest()`, bypassing all security guards, and passes `$checkToken=false` to `checkIfActionRequest()`, which allows an attacker-controlled action query parameter to override the dispatch target. 2. The `requireToken()` guard on `actionImpersonateWithToken()` only checks a boolean (`_hadToken`) that was set when the preview token was initially resolved. It does not verify that the token was intended for the impersonation action,…

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EUVD-2026-276463

fkie_cve-2026-32267

GHSA-cc7p-2j3x-x7xf — Craft CMS Vulnerable to Privilege Escalation/Bypass through UsersController->actionImpersonateWithToken()