7.5

CVE-2026-4987: brainstormforce sureforms – contact form, payment form & other custom form builder Improper Input Validation

CVSS: 7.5v3.1HighDeferred
Published 28-03-2026Last modified 08-04-2026
Open JSON

Vulnerability summary

CVE-2026-4987 is a high (CVSS 7.5) Improper Input Validation vulnerability in brainstormforce sureforms – contact form, payment form & other custom form builder. EPSS estimates a 1.16% chance of exploitation in the next 30 days, higher than 66.6% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
1.16%
0%100%
Low · +0.20 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 28-03-2026
    PublishedVulnerability first disclosed.
  2. 08-04-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

1.16%

Chance of exploitation in the next 30 days

Percentile

67%

Versus all other CVEs

30-day change

+0.20 pp

From 0.95% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.16%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Brainstormforce1 product
Wordpress1 product
  • sureforms≤ 2.5.2 (fixed in 2.6.0)

2 vendors · 2 products

References

3 links