paytiumsupport Paytium Mollie payment forms & donations Plugin up to 5.0.2 on WordPress Payment Meta paytium_user_data_processing pt_form_field/pt-user-role privileges management

Summaryinfo

A vulnerability categorized as critical has been discovered in paytiumsupport Paytium Mollie payment forms & donations Plugin up to 5.0.2. This issue affects the function paytium_user_data_processing of the component Payment Meta Handler. Executing a manipulation of the argument pt_form_field/pt-user-role can lead to privileges management. This vulnerability is registered as CVE-2026-18467. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in paytiumsupport Paytium Mollie payment forms & donations Plugin up to 5.0.2 and classified as critical. This vulnerability affects the function paytium_user_data_processing of the component Payment Meta Handler. The manipulation of the argument pt_form_field/pt-user-role with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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 wp_hash()/hash_equals() signature gate on the pt-paytium-user-data field, but left a second filter — pt_cf_checkout_meta(), registered on the pt_meta_values hook after the signed builder — that copies every $_POST['pt_form_field'][*] 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 paytium_user_data_processing() reads the persisted _pt-user-role post meta and passes it directly as the role argument to wp_insert_user(). 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 advisory is available at wordfence.com. This vulnerability was named CVE-2026-18467 since 07/31/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 5.0.3 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• paytiumsupport

Name

• Paytium Mollie payment forms & donations Plugin

Version

• 5.0.0
• 5.0.1
• 5.0.2

CPE 2.3info

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CPE 2.2info

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