# CVE-2026-103911: Code injection in Forminator Forms – Contact Form, Payment Form & Custom Form Builder

> Unauthenticated attackers can execute arbitrary shortcodes via search or comments, leading to code execution in WordPress installations using the Forminator Forms plugin.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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:** 16 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-42pr-q557-jgxc

## What is CVE-2026-103911?

CVE-2026-103911 is a medium-severity code injection vulnerability in wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The The Forminator Forms – Contact Form, Payment Form & Custom Form Builder plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 1.58.1. This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes. This is exploitable on any block-theme install via a single unauthenticated GET request to the search results page, or by submitting an anonymous comment on any post with comments enabled; no Forminator-specific content or configuration is required to trigger execution.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-103911?


## How do I fix CVE-2026-103911?

No fix has been published for CVE-2026-103911 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-103911 being exploited?

There is no known exploitation of CVE-2026-103911 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-103911 and fix it if it is affected.

What it is: CVE-2026-103911 is a medium-severity code injection vulnerability in wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder, published on 16 Oct 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-2026-103911 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-2026-103911/ (Markdown: https://insights.sbomify.com/CVE-2026-103911/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-103911
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-103911
- OSV: https://osv.dev/vulnerability/CVE-2026-103911

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-103911/
Summaries are generated and may contain mistakes; the official description above is the record.