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Vulnerability record · CVE-2026-47123 · published 29 May 2026

CVE-2026-47123: Authentication bypass by spoofing vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.19% · top 91.8% CWE-290 · Authentication bypass by spoofingCWE-345 · Insufficient verification of data authenticity Deferred
7.5CVSS 3.1 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
22 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N

References

LinkTags
https://github.com/freescout-help-desk/freescout/commit/d902f19038213c6a376947d269b00440908e88a0
https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-6r38-6mcf-2ww3
https://vincent.vulcoord.net/score/?state=Not+Scored&year=2026&year=2025&assigned_to=a165dae3-480e-4f7d-bbb8-9b1d78115b6

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-47123), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.