جزئیات آسیب‌پذیری

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.

• https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-6r38-6mcf-2ww3 x_refsource_CONFIRM
• https://github.com/freescout-help-desk/freescout/commit/d902f19038213c6a376947d269b00440908e88a0 x_refsource_MISC
• https://vincent.vulcoord.net/score/?state=Not+Scored&year=2026&year=2025&assigned_to=a165dae3-480e-4f7d-bbb8-9b1d78115b69&cve=CVE-2026-47123&analyze=1 exploit