CVE-2026-53592
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
20/07/2026
Last modified:
21/07/2026
Description
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.
Impact
Base Score 3.x
4.60
Severity 3.x
MEDIUM