CVE-2026-4987 SureForms <= 2.5.2 - Unauthenticated Payment Amount Validation Bypass via 'form_id'
Unauthenticated attackers can bypass payment validation in SureForms to create underpriced payment intents by manipulating the form_id parameter.
- 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-2026-4987?
CVE-2026-4987 is a high-severity vulnerability in brainstormforce SureForms – Contact Form, Payment Form & Other Custom Form Builder, published on 28 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The SureForms – Contact Form, Payment Form & Other Custom Form Builder plugin for WordPress is vulnerable to Payment Amount Bypass in all versions up to, and including, 2.5.2. This is due to the create_payment_intent() function performing a payment validation solely based on the value of a user-controlled parameter. This makes it possible for unauthenticated attackers to bypass configured form payment-amount validation and create underpriced payment/subscription intents by setting form_id to 0.
Weakness: CWE-20
Which versions are affected by CVE-2026-4987?
How do I fix CVE-2026-4987?
No fix has been published for CVE-2026-4987 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-4987 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4987 exists.
Public exploit code: 1 Nuclei template.
Sources
Also known as GHSA-v8h4-7xcp-85r6.