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CVE-2026-28289 - Vulnerability Analysis

CriticalCVSS: 10.0

Last Updated: March 3, 2026

FreeScout - Remote Code Execution

Published: March 3, 2026Updated: March 3, 2026Remote Exploitable

Overview

FreeScout <= 1.8.206 contains a remote code execution caused by a TOCTOU flaw in sanitizeUploadedFileName() allowing authenticated users with file upload permissions to bypass checks via zero-width space prefixed .htaccess files.

Severity & Score

Severity: Critical

CVSS Score: 10.0

Impact

Authenticated users with file upload permissions can execute arbitrary code remotely, leading to full server compromise.

Mitigation

Upgrade to version 1.8.207 or later.

References

https://github.com/freescout-help-desk/freescout/commit/f7bc16c56a6b13c06da52ad51fd666546b40818f
https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-5gpc-65p8-ffwp

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Details

CVE ID: CVE-2026-28289
Severity: Critical
CVSS Score: 10.0
Type: unrestricted_file_upload
Status: new

CWE

CWE-434

CVSS Metrics

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H