CVE-2026-4987
HighSureForms <= 2.5.2 - Unauthenticated Payment Amount Validation Bypass via 'form_id'
Published Mar 28, 2026 · Updated Apr 8, 2026 · Also known as c4772b32-a730-44f2-b43c-f9bd5abb6541
Key Facts
Patch in the next maintenance window- CVE-2026-4987 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting sureforms (wordpress-plugin), SureForms – Contact Form, Payment Form & Other Custom Form Builder.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 1.2% probability of exploitation in the next 30 days.
- Fixed versions are available, including sureforms 2.6.0.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS (30-day exploit likelihood)
1.2%
Higher than 66.6% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2026-4987 brief as a PDF
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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.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| sureformswordpress-plugin | See advisory | 2.6.0 |
| SureForms – Contact Form, Payment Form & Other Custom Form Builder | See advisory | n/a |
Patched Releases
sureforms
2.6.0
Timeline
Publicly disclosed
Mar 28, 2026
Last updated
Apr 8, 2026
Weakness Type
- CWE-20 Improper Input Validation
References
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/c4772b32-a730-44f2-b43c-f9bd5abb6541?source=api-prod
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/c4772b32-a730-44f2-b43c-f9bd5abb6541?source=api-scan
- otherhttps://plugins.trac.wordpress.org/changeset/3488858/sureforms
- otherhttps://www.wordfence.com/threat-intel/vulnerabilities/id/c4772b32-a730-44f2-b43c-f9bd5abb6541?source=cve
FAQ
Common Questions.
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.
Affected: sureforms (wordpress-plugin); SureForms – Contact Form, Payment Form & Other Custom Form Builder. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including sureforms 2.6.0.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
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