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    CVE-2026-28289

    FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. A patch bypass vulnerability for CVE-2026-27636 in FreeScout 1.8.206 and earlier allows any authenticated user with file upload permissions to achieve Remote Code Execution (RCE) on the server by uploading a malicious .htaccess file using a zero-width space character prefix to bypass the security check. The vulnerability exists in the sanitizeUploadedFileName() function in app/Http/Helper.php. The function contains a Time-of-Check to Time-of-Use (TOCTOU) flaw where the dot-prefix check occurs before sanitization removes invisible characters. This vulnerability is fixed in 1.8.207.

    Published:Mar 3, 2026
    Last Modified:Apr 16, 2026
    EPS:Mar 3, 2026
    EPSS Score:0.22277
    CVSS Score:10

    Affected Products

    Vendor
    Freescout
    Product
    Freescout
    Vendor
    Freescout Helpdesk
    Product
    Freescout

    Exploits

    https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-5gpc-65p8-ffwphttps://www.ox.security/blog/freescout-rce-cve-2026-28289/https://github.com/0xAshwesker/CVE-2026-28289https://github.com/0xBlackash/CVE-2026-28289

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs

    Related CVEs

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High