Formie: Missing authorization on sent notification resend modal exposes submission PII

Impact

The control panel action formie/sent-notifications/get-resend-modal-content (SentNotificationsController::actionGetResendModalContent) performed only requireAcceptsJson() and loaded a SentNotification by request id without permission or object-level authorization checks.

Any authenticated user who could invoke the action could enumerate notification IDs and read full email content — including recipient headers and the complete HTML body containing submitted form data (PII) — without formie-accessSentNotifications or equivalent permission. Sibling actions in the same controller enforced authorization.

Patches

Fixed in 3.1.31 (Craft 5) and 2.2.23 (Craft 4).

Craft 5: canView() is enforced after loading, consistent with actionEdit.
Craft 4: formie-viewSentNotifications permission is required.

Workarounds

Restrict CP access to trusted users only until upgraded. No configuration workaround.

• Reported by Jorge González (jorge@jmilla.es)