Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| freescout-help-desk / freescout | affected < 1.8.207 |
CWE
CWE-434
References
- https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-5gpc-65p8-ffwp
- https://github.com/freescout-help-desk/freescout/commit/f7bc16c56a6b13c06da52ad51fd666546b40818f
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.