[MEDIUM] 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 GHSA-59f3-vp2f-mp9w

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:
GitHub, FriendsOfPHP/security-advisories