CVE-2026-53591
CVSS 8.6 · YüksekNVD: Deferred
Açıklama (NVD)
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.223, an unauthenticated attacker can inject messages into any existing support conversation by sending a single email to the helpdesk's public address with a crafted `In-Reply-To` header. No credentials, tokens, or prior access are required. The injected message is rendered in the agent UI as a legitimate customer reply, the conversation is automatically reopened, and the `last_reply_from` field is set to the attacker's identity. Version 1.8.223 contains a fix.
Yayın: 20.07.2026 · Son değişiklik: 24.10.2026 · Zayıflık: CWE-287
CVSS 3.1 metrikleri
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
| Saldırı vektörü | Ağ (uzaktan) |
| Karmaşıklık | Düşük |
| Gereken yetki | Yok |
| Kullanıcı etkileşimi | Gerekmez |
| Kapsam | Değişmez |
| Gizlilik | Düşük |
| Bütünlük | Yüksek |
| Erişilebilirlik | Düşük |
Hesaplanan temel puan: 8.6. CVSS hesaplayıcıda incele