CVE-2026-45755: Mailtrap Mailer Webhook Parser Never Verifies the X-Mt-Signature HMAC: Unauthenticated Webhook Event Injection

PKSA-n517-312t-6vqg CVE-2026-45755

Affected package: symfony/mailtrap-mailer

Affected version: >=7.2.0,<7.3.0|>=7.3.0,<7.4.0|>=7.4.0,<7.4.12|>=8.0.0,<8.0.12

Reported by:
FriendsOfPHP/security-advisories