# CVE-2026-15748: Forminator Forms <= 1.56.1 - Unauthenticated Arbitrary File Upload via Forged Upload Field Configuration

> Unauthenticated attackers can upload executable files via forged field configurations, leading to remote code execution on WordPress sites using Forminator Forms.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Aug 2026
- **Updated:** 18 Aug 2026
- **Also known as:** GHSA-3p88-69p6-f6mj

## What is CVE-2026-15748?

CVE-2026-15748 is a critical vulnerability in wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Forminator Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.56.1 via the handle_file_upload function. This is due to insufficient file type validation in handle_file_upload, where the dangerous-extension blocklist performs exact-key matching that is bypassed by pipe-alternative MIME type keys, combined with a public submission handler that trusts attacker-controlled upload field configuration injected via a forged Select field value. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2026-15748?


## How do I fix CVE-2026-15748?

No fix has been published for CVE-2026-15748 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-15748 being exploited?

There is no known exploitation of CVE-2026-15748 in the wild and no public exploit code.

Public exploit code:

- CVE-2026-15748 - Unauthenticated RCE exploit for WordPress Forminator plugin (≤1.56.1). Automated detection, deep crawl, nonce extraction, and safe upload test. For authorized testing only. (github_poc): https://github.com/yora1928/cve-2026-15748
- Forminator Forms <= 1.56.1 - Unauthenticated Arbitrary File Upload via Forged Upload Field Configuration (github_poc): https://github.com/ubaydev/CVE-2026-15748
- Unauthenticated RCE in WordPress Forminator Forms <= 1.56.1 (CVSS 9.8) (github_poc): https://github.com/0x4cr/CVE-2026-15748

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15748 and fix it if it is affected.

What it is: CVE-2026-15748 is a critical vulnerability in wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-15748 in the wild and no public exploit code.

Affected product: wpmudev Forminator Forms – Contact Form, Payment Form & 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-2026-15748/ (Markdown: https://insights.sbomify.com/CVE-2026-15748/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15748
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15748
- OSV: https://osv.dev/vulnerability/CVE-2026-15748

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15748/
Summaries are generated and may contain mistakes; the official description above is the record.