A quick look at recent security hardening improvements that make Symfony safer by default.

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Symfony 7.4 introduces several security hardening improvements that strengthen the framework's defense-in-depth strategy. Key enhancements include message signing for Messenger handlers to prevent forged payload injection, safer HTML Sanitizer defaults that remove dangerous srcdoc attributes, stricter URL parsing aligned with WHATWG standards, restricted HTTP method override capabilities, improved CSRF protection with Sec-Fetch-Site header support, and deprecation of the ambiguous Request::get() method. These changes make Symfony safer by default without being CVE-worthy vulnerabilities.

Hardening Symfony: Recent Security Improvements (Symfony Blog)