๐Ÿ›ก๏ธ CVE-2026-28289
๐Ÿ”ด CVSS 10.0 โ€” Critical โš ๏ธ Exploit Public CWE-434 NVD
10.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity CRITICAL
CVSS Score 10.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE CWE-434
Public Exploit โš ๏ธ Yes
Source NVD
Published 2026-03-03
Updated 2026-06-02
Modified 2026-03-11

Affected Packages

Software From version Fixed in
freescout โ€” 1.8.207

Similar Threats

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