CVE-2026-53592: FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. A Prototype Pollution condition in the `getQueryParam` function…

PriorityP425medium4.6CVSS 3.1

AVNACHPRLUIRSUCLILAL

EPSS

0.19%

9.3th percentile

FreeScout 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.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
freescout-help-desk	freescout	< 1.8.223	1.8.223

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