FreeScout vulnerable to prototype pollution in getQueryParam

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53592
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-20 20:16:44 UTC
Updated2026-07-21 19:25:11 UTC
DescriptionFreeScout is a free help desk and shared inbox built with PHP's Laravel framework. A Prototype Pollution condition in the `getQueryParam` function `/public/js/main.js` and was addressed in version 1.8.139 by blocking URL query keys matching the pattern `__proto__`. However, this mitigation is incomplete: it only filters top-level `__proto__` keys and fails to sanitize nested forms such as `b[__proto__][polluted]=PWNED`. As a result, an attacker-controlled URL query string can still write into `Object.prototype` on any page that loads `main.js`. Version 1.8.223 contains a updated fix.

Risk And Classification

Primary CVSS: v3.1 4.6 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L

EPSS: 0.001190000 probability, percentile 0.021290000 (date 2026-07-21)

Problem Types: CWE-1321 | CWE-1321 CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.6MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
3.1CNADECLARED4.6MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Freescout-help-desk Freescout affected < 1.8.223 Not specified

References

ReferenceSourceLinkTags
github.com/freescout-help-desk/freescout/security/advisories/GHSA-w5fc-8... 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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