CVE-2026-28289HIGH 8.1EPSS p98.0%

CVE-2026-28289CVE-2026-28289

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.

Scoring

CVSS 3.18.1 (HIGH)
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS31.14% probability of exploitation · percentile 98.0% · 2026-06-18T12:00:27Z
Published2026-03-03
Last modified2026-03-11

Underlying weaknesses· 1

CWE-434

References

  1. https://github.com/freescout-help-desk/freescout/commit/f7bc16c56a6b13c06da52ad51fd666546b40818f
  2. https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-5gpc-65p8-ffwp
  3. https://www.ox.security/blog/freescout-rce-cve-2026-28289/

1

TypeTargetConfidenceTier
WeaknessUnrestricted Upload of File with Dangerous Typecwe-4340%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

CVE
CVE-2026-27636
CVE
CVE-2026-27637
CVE
CVE-2025-48471
CVE
CVE-2026-41193
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CVE-2026-32754
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CVE-2025-58163
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.