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CVE-2025-54366

Freescout remote code execution

8.8 HIGHPublic exploitEPSS 0.98%
  1. Published26 Jul 2025

Description

FreeScout is a lightweight free open source help desk and shared inbox built with PHP (Laravel framework). In versions 1.8.185 and below, there is a critical deserialization vulnerability in the /conversation/ajax endpoint that allows authenticated users with knowledge of the APP_KEY to achieve remote code execution. The vulnerability occurs when the application processes the attachments_all and attachments POST parameters through the insecure Helper::decrypt() function, which performs unsafe deserialization of user-controlled data without proper validation. This flaw enables attackers to create arbitrary objects and manipulate their properties, leading to complete compromise of the web application. This is fixed in version 1.8.186.

CVSS 3.1 breakdown

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

Affected products

Freescout< 1.8.86

Remediation

Fixed in
Freescout≥ 1.8.86

References

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Frequently asked

Is CVE-2025-54366 being actively exploited?

CVE-2025-54366 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.98%.

How severe is CVE-2025-54366?

CVE-2025-54366 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.98% probability of exploitation.

Which products are affected by CVE-2025-54366?

Affected products include Freescout.

How do I fix CVE-2025-54366?

Upgrade affected software to a fixed version, for example Freescout 1.8.86 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-54366 against the real software inventory on every managed device, every day. 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.