Description
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.
Published: 2026-09-24
Score: 9.8 Critical
EPSS: < 1% Very Low
KEV: No
Impact: Privilege Escalation to Administrator
Action: Patch Immediately
AI Analysis

Impact

The Paytium: Mollie payment forms & donations plugin allows unauthenticated users to submit a payment form that includes a specially crafted 'pt-user-role' field. Because the plugin copies the field into the payment metadata without verifying its signature, an attacker can set this value to 'administrator'. After the payment flow completes, the plugin stores the field and later passes it directly to wp_insert_user(), creating a new WordPress account with administrator privileges. This results in full site takeover since the attacker can use the lost‑password flow with a supplied email address.

Affected Systems

WordPress sites running Paytium: Mollie payment forms & donations up to and including version 5.0.3. The vulnerability is tied to the plugin’s payment processing code and does not depend on other components.

Risk and Exploitability

The CVSS score of 9.8 indicates critical severity. EPSS information is not available, so the likelihood of exploitation is uncertain; however, the vulnerability is publicly exploitable via any publicly exposed [paytium] shortcode, and the KEV status is not listed. Attackers only need to submit a payment as a guest and complete the flow, after which they can create a privileged account with no prior authentication. The impact is compromise of the entire WordPress installation.

Generated by OpenCVE AI on September 24, 2026 at 02:22 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade the Paytium plugin to the latest version that removes the unchecked role injection path
  • Verify that no new administrator accounts appear after the upgrade by reviewing the Users list and monitoring user‑creation logs
  • Restrict access to the [paytium] shortcode for unauthenticated users until a patch is applied, such as disabling the shortcode in public posts or using a security plugin to block the form for guests

Generated by OpenCVE AI on September 24, 2026 at 02:22 UTC.

Tracking

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Advisories

No advisories yet.

History

Thu, 24 Sep 2026 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Paytiumsupport
Paytiumsupport paytium: Mollie Payment Forms & Donations
Wordpress
Wordpress wordpress
Vendors & Products Paytiumsupport
Paytiumsupport paytium: Mollie Payment Forms & Donations
Wordpress
Wordpress wordpress

Thu, 24 Sep 2026 01:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Paytium: Mollie payment forms & donations <= 5.0.3 - Unauthenticated Privilege Escalation via 'pt_form_field[pt-user-role]' Parameter
Weaknesses CWE-269
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Subscriptions

Paytiumsupport Paytium: Mollie Payment Forms & Donations
Wordpress Wordpress
cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-09-24T15:04:13.676Z

Reserved: 2026-07-31T08:28:18.576Z

Link: CVE-2026-18467

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-09-24T02:16:52.943

Modified: 2026-09-24T16:17:07.393

Link: CVE-2026-18467

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-24T09:08:59Z

Weaknesses
  • CWE-269

    Improper Privilege Management