# 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.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Mar 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-v8h4-7xcp-85r6

## 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 (Improper Input Validation)

## 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:

- SureForms <= 2.5.2 - Unauthenticated Payment Amount Validation Bypass via form_id (nuclei): http/cves/2026/CVE-2026-4987.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4987 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4987 exists.

Affected product: brainstormforce SureForms – Contact Form, Payment Form & Other Custom Form Builder. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-4987/ (Markdown: https://insights.sbomify.com/CVE-2026-4987/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4987
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4987
- OSV: https://osv.dev/vulnerability/CVE-2026-4987

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-4987/
Summaries are generated and may contain mistakes; the official description above is the record.