The Paytium: Mollie payment forms & donations plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 5.0.3. The 5.0.3 patch introduced a wphash()/hashequals() signature gate on the pt-paytium-user-data field, but left a second filter — ptcfcheckoutmeta(), registered on the ptmetavalues hook after the signed builder — that copies every $POST['ptformfield'][] key verbatim into the payment meta array without any signature verification; this allows the pt-user-role value it copies to overwrite the signed path's output, after which paytiumuserdataprocessing() reads the persisted pt-user-role post meta and passes it directly as the role argument to wpinsertuser(). This makes it possible for unauthenticated attackers to register a new WordPress account with the administrator role and fully take over the site. Exploitation requires submitting a payment through a publicly-exposed [paytium] shortcode form and completing the resulting payment flow, after which the attacker can seize the new administrator account via the standard lost-password flow on their supplied email address.

The Paytium: Mollie payment forms & donations plugin for WordPress is vulnerable to unauthorized data modification due to a missing capability check on the createmollieprofile function in versions up to, and including, 4.3.7. This makes it possible for authenticated attackers with subscriber-level access to create a mollie payment profile.

The Paytium: Mollie payment forms & donations plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the checkmollieaccountdetails function in versions up to, and including, 4.3.7. This makes it possible for authenticated attackers with subscriber-level access to verify the existence of a mollie account.

The Paytium: Mollie payment forms & donations plugin for WordPress is vulnerable to unauthorized notification dismissal due to a missing capability check on the paytiumnoticedismiss function in versions up to, and including, 4.3.7. This makes it possible for authenticated attackers with subscriber-level access to dismiss admin notices.

The Paytium: Mollie payment forms & donations plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the createmollieaccount function in versions up to, and including, 4.3.7. This makes it possible for authenticated attackers with subscriber-level access to set up a mollie account.

The Paytium: Mollie payment forms & donations plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the checkforverifiedprofiles function in versions up to, and including, 4.3.7. This makes it possible for authenticated attackers with subscriber-level access to check profile statuses.

The Paytium: Mollie payment forms & donations plugin for WordPress is vulnerable to unauthorized API key update due to a missing capability check on the paytiumswsaveapikeys function in versions up to, and including, 4.3.7. This makes it possible for authenticated attackers with subscriber-level access to change plugin API keys.

The Paytium: Mollie payment forms & donations plugin for WordPress is vulnerable to unauthorized data modification due to a missing capability check on the updateprofilepreference function in versions up to, and including, 4.3.7. This makes it possible for authenticated attackers with subscriber-level access to change plugin settings.

The Paytium: Mollie payment forms & donations plugin for WordPress is vulnerable to unauthorized subscription cancellation due to a missing capability check on the ptcancelsubscription function in versions up to, and including, 4.3.7. This makes it possible for authenticated attackers with subscriber-level access to cancel a subscription to the plugin.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in David de Boer Paytium: Mollie payment forms & donations allows Stored XSS.This issue affects Paytium: Mollie payment forms & donations: from n/a through 4.4.2.

The Paytium: Mollie payment forms & donations WordPress plugin before 4.3.7 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfilteredhtml capability is disallowed (for example in multisite setup).