CVE-2026-28289

Katalog CVE

CVSS 8.1 · High EPSS 2,7%

Kerentanan Unrestricted Upload of File with Dangerous Type pada freescout. Skor CVSS 3.1 8.1 (High) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

3 Maret 2026

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

8.1 (High), sumber NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-434: Unrestricted Upload of File with Dangerous Type

EPSS (30 hari)

2,7% peluang dieksploitasi; lebih tinggi dari 85,3% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-5gpc-65p8-ffwp exploit · mitigasi · advisory vendor
• https://www.ox.security/blog/freescout-rce-cve-2026-28289/ exploit · advisory vendor
• https://github.com/freescout-help-desk/freescout/commit/f7bc16c56a6b13c06da52ad51fd666546b40818f patch