Payment Amount Bypass in SureForms Contact and Payment Form Plugin by WordPress
CVE-2026-4987

7.5HIGH

Key Information:

Vendor

WordPress
Status
Sureforms – Contact Form, Payment Form & Other Custom Form Builder
Vendor
CVE Published:
28 March 2026

What is CVE-2026-4987?

The SureForms plugin for WordPress, specifically in versions up to and including 2.5.2, contains a vulnerability that allows unauthenticated attackers to bypass payment amount validation. This issue arises from the create_payment_intent() function, which relies solely on a user-controlled parameter for payment validation. Attackers can exploit this flaw by setting the form_id to 0, enabling them to create underpriced payment and subscription intents, effectively undermining the intended payment processing mechanism of the plugin.

Affected Version(s)

SureForms – Contact Form, Payment Form & Other Custom Form Builder 0 <= 2.5.2

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/changeset/3488858/sure...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jack Pas
.