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Vulnerabilities

Vulnerability · CVE-2025-54366

FreeScout is a lightweight free open source help desk and shared inbox built with PHP (Laravel framework).

Published Jul 26, 2025 · catalog updated Jul 28, 2025 · FreeScout is a lightweight

Check if you run it

No confirmed exploitation is on record for CVE-2025-54366. EPSS is 1.05%. Act only if a listed version of FreeScout is a lightweight is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (FreeScout is a lightweight).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.05%
Remediation
Version ranges on file
Affected products
vendor freescout-help-desk freescout < 1.8.186

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 crea

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor freescout-help-desk freescout < 1.8.186< 1.8.186

How to fix CVE-2025-54366

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-54366. EPSS is 1.05%. Act only if a listed version of FreeScout is a lightweight is installed.

Which versions are affected?

Compare what you have installed with freescout-help-desk freescout < 1.8.186 < 1.8.186. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.05%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 26, 2025 · EUVD

    Detected

    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 a

  2. Jul 28, 2025 · EUVD

    Updated

    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 a

Sources

  • CVE.orgVulnerability recordCVE-2025-54366

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-22772

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Jul 28, 2025. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.