CVE-2026-40567: FreeScout has HTML Injection in Outgoing Emails via Unsanitized Customer Name in Signature Variables
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-40567?
CVE-2026-40567 is rated as a high severity vulnerability due to the potential for arbitrary HTML injection into outgoing emails.
How do I fix CVE-2026-40567?
To fix CVE-2026-40567, upgrade FreeScout to version 1.8.213 or later.
Who is affected by CVE-2026-40567?
Users of FreeScout versions prior to 1.8.213 are affected by CVE-2026-40567.
What type of vulnerability is CVE-2026-40567?
CVE-2026-40567 is an HTML injection vulnerability that allows attackers to inject malicious content into emails.
Can CVE-2026-40567 be exploited by unauthenticated attackers?
Yes, CVE-2026-40567 can be exploited by unauthenticated attackers through the customer name in signature variables.