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CVE-2026-53592— FreeScout vulnerable to prototype pollution in getQueryParam

Quick assessment

Affected
freescout-help-desk freescout
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeScout是FreeScout公司开源的一个使用 PHP(Laravel 框架)构建的超轻量级且功能强大的免费开源帮助台和共享收件箱。 FreeScout 1.8.223之前版本存在输入验证错误漏洞，该漏洞源于getQueryParam函数中的原型污染条件，由于清理不完整，仅过滤顶层__proto__键，未能清理嵌套形式，导致攻击者控制的URL查询字符串仍可在加载main.js的页面上写入Object.prototype。

CVSS 4.6 · Medium EPSS 0.19% · P8

Affected Version Matrix 1

VendorProduct Version RangeStatus
freescout-help-desk freescout < 1.8.223 affected
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I. Basic Information for CVE-2026-53592

Vulnerability Information
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Vulnerability Title
FreeScout vulnerable to prototype pollution in getQueryParam
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
FreeScout 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeScout是FreeScout公司开源的一个使用 PHP(Laravel 框架)构建的超轻量级且功能强大的免费开源帮助台和共享收件箱。 FreeScout 1.8.223之前版本存在输入验证错误漏洞，该漏洞源于getQueryParam函数中的原型污染条件，由于清理不完整，仅过滤顶层__proto__键，未能清理嵌套形式，导致攻击者控制的URL查询字符串仍可在加载main.js的页面上写入Object.prototype。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
freescout-help-desk freescout < 1.8.223 -

II. Public POCs for CVE-2026-53592

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III. Intelligence Information for CVE-2026-53592

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Vendor Advisories for CVE-2026-53592 (1)

Same Patch Batch · freescout-help-desk · 2026-07-20 · 8 CVEs total

CVE-2026-53595 9.4 CRITICAL FreeScout vulnerable to anonymous account takeover via /user-setup empty invite_hash on My
CVE-2026-53593 8.8 HIGH FreeScout Vulnerable to Authenticated Remote Code Execution via incomplete upload extensio
CVE-2026-53591 8.6 HIGH FreeScout Vulnerable to Unauthenticated Conversation Thread Injection via HMAC Length Bypa
CVE-2026-48812 7.5 HIGH FreeScout Allows Unauthenticated Access to Legacy Attachment Files
CVE-2026-45295 6.5 MEDIUM FreeScout Vulnerable to Unauthenticated Thread Read-Status Manipulation and Conversation E
CVE-2026-53596 5.3 MEDIUM FreeScout has unrestricted file upload without rate limiting that leads to resource exhaus
CVE-2026-53594 4.9 MEDIUM FreeScout has Arbitrary File Read in App Logs Viewer via Forged Encrypted Path

IV. Related Vulnerabilities

Same product: freescout
Same vendor: freescout-help-desk
Same weakness: CWE-1321

V. Comments for CVE-2026-53592

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