Fix CVE-2021-43503 in Laravel HIGH

Fix CVE-2021-43503 (mass assignment bypass) in Laravel for PHP. Paste your composer.json into PackageFix and get a patched version back — no CLI, no signup.

⚠ Vulnerability

CVE-2021-43503 — mass assignment bypass in Laravel. Update to ^10.0 or later.

Vulnerable Version — composer.json

"laravel/framework": "^8.0"

Fixed Version — composer.json

"laravel/framework": "^10.0"

✓ Fix

Update to ^10.0 and run composer install to apply the fix.

Scan your dependencies now — paste your manifest, get a fixed version back in seconds.

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Frequently Asked Questions

What is CVE-2021-43503?

CVE-2021-43503 is a vulnerability in Laravel that allows mass assignment bypass. Update to version ^10.0 or later to fix it.

Is CVE-2021-43503 on the CISA KEV catalog?

Check the live CISA KEV catalog at packagefix.dev — the catalog updates daily and PackageFix always reflects the current status.

How do I fix CVE-2021-43503 in Laravel?

Update Laravel to version ^10.0 or later in your composer.json. Run composer install after updating.

Does CVE-2021-43503 affect all versions of Laravel?

Check the OSV advisory for the exact affected version range. PackageFix shows the minimum safe version for your installed version.