High severity · published Mar 28, 2026
CVE-2026-4987
SureForms <= 2.5.2 - Unauthenticated Payment Amount Validation Bypass via 'form_id'
7.5
CVSS
1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 61% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SC
SureForms – Contact Form, Payment Form & Other Custom Form Builder · brainstormforce
through 2.5.2 · source: vendor
Affected product
SC
SureForms – Contact Form, Payment Form & Other Custom Form Builder
brainstormforce
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4987
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-4987
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/changeset/3488858/sureforms
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/c4772b32-a730-44f2-b43c-f9bd5abb6541?source=cve
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