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CVE-2026-40569
No affected components available
FreeScout is a free self-hosted help desk and shared mailbox. Versions prior to 1.8.213 have a mass assignment vulnerability in the mailbox connection settings endpoints of FreeScout (connectionIncomingSave() at app/Http/Controllers/MailboxesController.php:468 and connectionOutgoingSave() at line 398). Both methods pass $request->all() directly to $mailbox->fill() without any field allowlisting, allowing an authenticated admin to overwrite any of the 32 fields in the Mailbox model's $fillable array -- including security-critical fields that do not belong to the connection settings form, such as auto_bcc, out_server, out_password, signature, auto_reply_enabled, and auto_reply_message. Validation in connectionIncomingSave() is entirely commented out, and the validator in connectionOutgoingSave() only checks value formats for SMTP fields without stripping extra parameters. An authenticated admin user can exploit this by appending hidden parameters (e.g., auto_bcc=attacker@evil.com) to a legitimate connection settings save request. Because the auto_bcc field is not displayed on the connection settings form (it only appears on the general mailbox settings page), the injection is invisible to other administrators reviewing connection settings. Once set, every outgoing email from the affected mailbox is silently BCC'd to the attacker via the SendReplyToCustomer job. The same mechanism allows redirecting outgoing SMTP through an attacker-controlled server, injecting tracking pixels or phishing links into email signatures, and enabling attacker-crafted auto-replies -- all from a single HTTP request. This is particularly dangerous in multi-admin environments where one admin can silently surveil mailboxes managed by others, and when an admin session is compromised via a separate vulnerability (e.g., XSS), the attacker gains persistent email exfiltration that survives session expiry. Version 1.8.213 fixes the issue.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a low impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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