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CVE-2025-54366

FreeScout's deserialization of untrusted data leads to Remote Code Execution

Published: Jul 26, 2025Updated: Sep 11, 2025 Sources: CVE List NVDCWE-502
NVD MITRE
8.8CVSSHIGH
EPSS Score
0.9%
Top 43.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-502

Affected Products

freescoutfreescout
Mixed
Enterprise Software / itsm-monitoring
freescoutfreescout-help-desk
On-premWeb App
Enterprise Software / itsm-monitoring
freescoutcommercialEnterprise Softwareaka freescout
freescout-help-deskcommercialEnterprise Software

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

3 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/freescout-help-desk/freescout/commit/9669c57f1ddbee896752d9e16270abfd97b20eb9
github.com
https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-vcc2-6r66-gvvj
github.com

Timeline

Published
Jul 26, 2025
Last Updated
Sep 11, 2025

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