CVE-2026-18467 Privilege escalation in Paytium: Mollie payment forms & donations
Unauthenticated attackers can escalate privileges to administrator by manipulating payment form metadata, leading to full site takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18467?
CVE-2026-18467 is a critical vulnerability in paytiumsupport Paytium: Mollie payment forms & donations, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-269
Which versions are affected by CVE-2026-18467?
How do I fix CVE-2026-18467?
No fix has been published for CVE-2026-18467 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-18467 being exploited?
There is no known exploitation of CVE-2026-18467 in the wild and no public exploit code.
Sources
Also known as GHSA-pjhr-j4c6-9f6g.