Report: CVE-2026-47123 - FreeScout: Agent Impersonation via Missing HMAC Verification on Notification Rep

Report: CVE-2026-47123 - FreeScout: Agent Impersonation via Missing HMAC Verification on Notification Rep

CVE ID :CVE-2026-47123 Published : May 29, 2026, 8:16 p.m. | 45 minutes ago Description :FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to 1.8.220, the email processing pipeline in FreeScout's FetchEmails command has two code paths for identifying agent (user) replies based on In-Reply-To / References headers. The notification reply path (notify-{thread_id}-{user_id}-...) extracts thread_id and user_id directly from the Message-ID without HMAC verification. An external attacker who can spoof the From address of a helpdesk agent can inject messages that FreeScout processes as legitimate agent replies — which are then automatically forwarded to customers via the legitimate SMTP server. This vulnerability is fixed in 1.8.220. Severity: 7.5 | HIGH Visit the link for more details, such as CVSS details, affected products, timeline, and more...

CVE Details

Severity
HIGH
Published
May 29, 2026
Affected Product: PHP