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CVE-2026-28289

Freescout remote code execution

10.0 CRITICALPublic exploitEPSS 2.66%
  1. Published3 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Freescout< 1.8.207

Remediation

Fixed in
Freescout≥ 1.8.207

References

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Frequently asked

Is CVE-2026-28289 being actively exploited?

CVE-2026-28289 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 2.66%.

How severe is CVE-2026-28289?

CVE-2026-28289 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 2.66% probability of exploitation.

Which products are affected by CVE-2026-28289?

Affected products include Freescout.

How do I fix CVE-2026-28289?

Upgrade affected software to a fixed version, for example Freescout 1.8.207 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-28289 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.