FreeScout CVE-2026-40567

| EUVD-2026-24168 MEDIUM
Improper Encoding or Escaping of Output (CWE-116)
2026-04-21 GitHub_M
5.8
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

2
Patch available
Apr 21, 2026 - 18:01 EUVD
Analysis Generated
Apr 21, 2026 - 16:59 vuln.today

DescriptionNVD

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.

AnalysisAI

HTML injection in FreeScout prior to version 1.8.213 allows unauthenticated attackers to inject arbitrary HTML into outgoing support emails by crafting a malicious From display name. The unsanitized name is stored in the database and rendered unescaped via the {%customer.fullName%} template variable in reply emails, enabling attackers to embed phishing links, tracking pixels, and spoofed content in emails sent from the organization's legitimate address. …

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CVE-2026-40567 vulnerability details – vuln.today

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