🛡️ CVE-2026-53592

🟡 CVSS 4.6 — Medium ✅ No Known Exploit CWE-1321 NVD
4.6
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability low.

Weakness class

CVE-2026-53592 is classified as CWE-1321: Prototype Pollution. Attacker input can modify an object prototype, changing behaviour for objects across the application.

Affected software

CVE-2026-53592 is recorded against 1 package.

  • unknown

Timeline and source

Published on 20 July 2026 and last revised on 21 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com

Details

Severity MEDIUM
CVSS Score 4.6
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
CWE CWE-1321
Public Exploit ✅ No
Source NVD
Published 2026-07-20
Updated 2026-08-11
Modified 2026-07-21
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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