FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, an unauthenticated attacker can inject arbitrary HTML into outgoing emails generated by FreeScout by sending an email with a crafted From display name. The name is stored in the database without sanitization and rendered unescaped into outgoing reply emails via the {%customer.fullName%} signature variable. This allows embedding phishing links, tracking pixels, and spoofed content inside legitimate support emails sent from the organization's address. Version 1.8.213 fixes the issue.
Exploitability
AV:NAC:LPR:NUI:NScope
S:CImpact
C:NI:LA:N5.8/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:NInput Validation