# CVE-2026-4327: Code injection in The Welcomizer

> Authenticated attackers with Subscriber access can execute arbitrary PHP code via the twiz_custom_logic parameter due to missing authorization checks and eval usage.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Sep 2026
- **Updated:** 19 Sep 2026
- **Also known as:** GHSA-fmwg-rf74-rjqj

## What is CVE-2026-4327?

CVE-2026-4327 is a high-severity code injection vulnerability in sebwordpress The Welcomizer, published on 19 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The The Welcomizer plugin for WordPress is vulnerable to Remote Code Execution in all versions up to and including 2.8.1. This is due to missing authorization checks on the twiz_ajax_callback AJAX action's 'savesection' handler combined with the use of eval() to execute user-supplied 'custom logic' code on the frontend. The AJAX handler at twiz-ajax.php verifies a nonce but performs no current_user_can() capability check for the ACTION_SAVE_SECTION case. Furthermore, the nonce is exposed to any authenticated user through the directly-accessible twiz-ajax.js.php file which loads WordPress and outputs the nonce. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary PHP code via the twiz_custom_logic POST parameter when saving a section with output choice 'twiz_logic_output'.

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

## Which versions are affected by CVE-2026-4327?


## How do I fix CVE-2026-4327?

No fix has been published for CVE-2026-4327 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4327 being exploited?

There is no known exploitation of CVE-2026-4327 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4327 and fix it if it is affected.

What it is: CVE-2026-4327 is a high-severity code injection vulnerability in sebwordpress The Welcomizer, published on 19 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-4327 in the wild and no public exploit code.

Affected product: sebwordpress The Welcomizer. 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-2026-4327/ (Markdown: https://insights.sbomify.com/CVE-2026-4327/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4327
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4327
- OSV: https://osv.dev/vulnerability/CVE-2026-4327

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4327/
Summaries are generated and may contain mistakes; the official description above is the record.