# CVE-2026-4809: Plank laravel-mediable arbitrary file upload in file handling

Source: https://junglewise.ai/threats/cve-2026-4809-plank-laravel-mediable-arbitrary-file-upload-in-file-handling  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-26. Updated: 2026-05-19  
License: CC BY 4.0 with a link back

CVE-2026-4809 · Severity: critical · CVSS 9.8 · Published 2026-03-26

A security vulnerability in the Laravel-Mediable library allows attackers to upload malicious files to a web server. This library is used by developers to manage file uploads and attachments in Laravel applications. By disguising executable code as a harmless image, an attacker could potentially take full control of the server, leading to data theft or service disruption.

Technologies: [Plank Mediable](https://junglewise.ai/threats/technologies/mediable). Vendors: [Plank](https://junglewise.ai/threats/vendors/plank).

## Quick answers

**Is CVE-2026-4809 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-4809 being exploited in the wild.

**How severe is CVE-2026-4809?** Critical severity, with a CVSS score of 9.8, published 26 March 2026.

**Which products and versions are affected?** Plank Mediable Through 6.4.0.

**Is there a fix for CVE-2026-4809?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-4809 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-4809?** Check whether you run Plank Mediable at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A vulnerability classified as CWE-434 (Unrestricted Upload of File with Dangerous Type) exists in plank/laravel-mediable through version 6.4.0. The issue arises when an application is configured to trust or prefer client-supplied MIME types during file upload handling. A remote, unauthenticated attacker can exploit this by submitting a file containing PHP code while declaring a benign MIME type (such as image/jpeg). If the application stores these files in a web-accessible directory without proper server-side validation or execution prevention, the attacker can achieve remote code execution (RCE). As of the advisory date, no patch is available.

## Affected products

- Plank laravel-mediable Through 6.4.0

## Timeline

- 2026-03-26: advisory: NVD publication date
- 2026-03-26: disclosed: Vulnerability reported by TuranSec

## References

- [https://github.com/plank/laravel-mediable](https://github.com/plank/laravel-mediable)
- [https://github.com/plank/laravel-mediable/releases/tag/6.4.0](https://github.com/plank/laravel-mediable/releases/tag/6.4.0)

## Related threats

- [Plank Laravel-Mediable stored XSS via SVG file upload](https://junglewise.ai/threats/cve-2026-49971-plank-laravel-mediable-stored-xss-via-svg-file-upload)
- [Plank Laravel-Mediable path traversal in File::sanitizePath](https://junglewise.ai/threats/cve-2026-49970-plank-laravel-mediable-path-traversal-in-file-sanitizepath)