Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Freescout | Freescout | < 1.8.86 |
Related Weaknesses (CWE)
References
- https://github.com/freescout-help-desk/freescout/commit/9669c57f1ddbee896752d9e1Patch
- https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-vcc2-6ExploitVendor Advisory
FAQ
What is CVE-2025-54366?
CVE-2025-54366 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 /conv...
How severe is CVE-2025-54366?
CVE-2025-54366 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-54366?
Check the references section above for vendor advisories and patch information. Affected products include: Freescout Freescout.