CVE-2026-27637: critical vulnerability in freescout-help-desk freescout
FreeScout's Predictable Authentication Token Enables Account Takeover
Published
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.8epss 0.8%
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.206, FreeScout's `TokenAuth` middleware uses a predictable authentication token computed as `MD5(user_id + created_at + APP_KEY)`. This token is static (never expires/rotates), and if an attacker obtains the `APP_KEY` — a well-documented and common exposure vector in Laravel applications — they can compute a valid token for any user, including the administrator, achieving full account takeover without any password. This vulnerability can be exploited on its own or in combination with CVE-2026-27636. Version 1.8.206 fixes both vulnerabilities.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
freescout-help-desk · freescoutRelated CVEs — freescout-help-desk freescout
In the same product, most dangerous first.
CVE-2026-28289CRITICALFreeScout 1.8.206 Patch Bypass for CVE-2026-27636 via Zero-Width Space Character Leads to Remote Code ExecutionEPSS 35.1%CVE-2026-27636HIGHFreeScout: Missing .htaccess in Restricted File Extensions Allows Remote Code Execution on ApacheEPSS 2.2%CVE-2026-53595CRITICALFreeScout vulnerable to anonymous account takeover via /user-setup empty invite_hash on MySQLEPSS 1.9%CVE-2025-48471HIGHFreeScout Vulnerable to Arbitrary File UploadEPSS 1.2%CVE-2025-54366HIGHFreeScout's deserialization of untrusted data leads to Remote Code ExecutionEPSS 1.1%CVE-2025-48389HIGHFreeScout Vulnerable to Deserialization of Untrusted DataEPSS 1.0%