{
    "id": "CVE-2026-28289",
    "published": "2026-03-03 23:15:56",
    "last_modified": "2026-06-17 10:28:26",
    "cvss_score": "10.0",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
    "cwe": "CWE-434",
    "description": "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.",
    "epss_score": "0.02661",
    "epss_percentile": "0.85330",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-13 18:18:00",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (10), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "freescout",
            "product": "freescout"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://github.com/freescout-help-desk/freescout/commit/f7bc16c56a6b13c06da52ad51fd666546b40818f",
        "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-5gpc-65p8-ffwp",
        "https://www.ox.security/blog/freescout-rce-cve-2026-28289/"
    ]
}