CVE-2026-53591

FreeScout (Laravel-based) prior to v1.8.223 is vulnerable: an unauthenticated attacker can inject messages into existing conversations by sending an email to the public address with a crafted In-Reply-To header. The injected message appears as a legitimate customer reply, reopens the conversation...

Mutt 安全漏洞

Mutt is a text-based e-mail client for Unix-like systems developed by Michael Elkins. A security vulnerability exists in Mutt that stems from the In-Reply-To email header field not being protected by a cryptographic signature, which allows an attacker to reuse unencrypted but signed email message...