GHSA-59f3-vp2f-mp9w Symfony's Mailtrap Mailer Webhook Parser Never Verifies the X-Mt-Signature HMAC — Unauthenticated Webhook Event Injection

• Packagist symfony/mailtrap-mailer: >= 7.2.0, < 7.4.12 → fixed in 7.4.12 • Packagist symfony/mailtrap-mailer: >= 8.0.0, < 8.0.12 → fixed in 8.0.12 • Packagist symfony/symfony: >= 7.2.0, < 7.4.12 → fixed in 7.4.12 • Packagist symfony/symfony: >= 8.0.0, < 8.0.12 → fixed in 8.0.12

Description The Mailtrap mailer bridge ships a webhook request parser used to authenticate and decode the event callbacks Mailtrap POSTs to an application's webhook endpoint. Its `doParse(Request $request, #[\SensitiveParameter] string $secret)` method receives the configured webhook secret but never reads it; it decodes and returns the payload unconditionally, ignoring the `X-Mt-Signature` HMAC header Mailtrap sends with each request. As a result, an application that wires up the Mailtrap webhook endpoint accepts any POST to that URL, even when a signing secret is configured (the recommended setup). An attacker who knows the endpoint exists can submit forged event payloads, fake delivery / bounce / open / click / spam events, leading to suppression-list corruption, delivery-metrics fraud, etc. Resolution `MailtrapRequestParser::doParse()` now requires and verifies the `X-Mt-Signature` header, an HMAC-SHA256 of the raw request body keyed with the configured secret, before decoding the payload, using a constant-time comparison. When no secret is configured the behaviour is unchanged: signature verification remains opt-in, but it is now actually enforced once opted in. The patch for this issue is available here for branch 7.4. Credits Symfony would like to thank Himanshu Anand for reporting the issue and Alexandre Daubois providing the fix.