Is this vulnerability remotely exploitable?

Yes. If an upload endpoint is accessible over the network and uses laravel-mediable in a configuration that trusts client-supplied MIME types, an attacker can exploit it remotely by uploading a crafted file and then requesting it if it is web-accessible.

What level of access does an attacker need?

The attacker needs whatever access is required to use the file upload functionality. In many applications this may be available to unauthenticated users (e.g., contact forms) or low-privilege accounts, which significantly broadens exposure.

What is the safest general fix pattern?

The safest pattern is to perform strict, server-side validation of uploaded files using a positive allowlist, ignore or de-prioritize client-supplied MIME types for trust decisions, and store all uploads in non-executable locations outside the web root or behind non-executable static file handlers.

Severity:

CRITICAL RISK

(9.8)

Unrestricted File Upload (CWE-434) via Client-Supplied MIME Types in Laravel Mediable

CVE-2026-4809

Published:

Mar 26, 2026

Status:

Awaiting Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Unrestricted File Upload

CWE:

CWE-434

Impact:

Remote Code Execution via Arbitrary File Upload

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Unrestricted File Upload

CWE:

CWE-434

Impact:

Remote Code Execution via Arbitrary File Upload

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Unrestricted File Upload (CWE-434) via Client-Supplied MIME Types in Laravel Mediable

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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