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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2025-54366

29
FAUCET Score

CVE-2025-54366 is a critical deserialization vulnerability affecting FreeScout versions 1.8.185 and below, a PHP-based help desk and shared inbox. This flaw allows authenticated users with knowledge of the APP_KEY to achieve remote code execution by manipulating the attachments_all and attachments POST parameters via an insecure decryption function. Rated 8.8 HIGH on the CVSS scale, it presents a low-complexity attack vector that can lead to complete compromise of the web application. While no public exploit intelligence or active exploitation has been observed, and community discussion is minimal, the vulnerability is fixed in version 1.8.186.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.8.86CPE matchmatch criteria
cpe:2.3:a:freescout:freescout:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

8.6HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.98%
Probability of exploitation in next 30 days
EPSS Percentile
58.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0098 is in the 54th percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / freescout-help-desk/freescout/commit/9669c57f1ddbee896752d9e16270abfd97b20eb9
Patch
github.com / freescout-help-desk/freescout/security/advisories/GHSA-vcc2-6r66-gvvj
ExploitVendor Advisory