FKIE_CVE-2026-53592

Vulnerability from fkie_nvd - Published: 2026-07-20 20:16 - Updated: 2026-10-24 20:10
Severity
4.6 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
Summary
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.
References
security-advisories@github.comhttps://github.com/freescout-help-desk/freescout/security/advisories/GHSA-w5fc-8pp3-f755
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-w5fc-8pp3-f755
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "freescout",
          "vendor": "freescout-help-desk",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.8.223"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "FreeScout is a free help desk and shared inbox built with PHP\u0027s 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."
    },
    {
      "lang": "es",
      "value": "FreeScout es una mesa de ayuda gratuita y bandeja de entrada compartida construida con el framework Laravel de PHP. Una condici\u00f3n de Contaminaci\u00f3n de Prototipos en la funci\u00f3n \u2019getQueryParam\u2019 de \u2019/public/js/main.js\u2019 fue abordada en la versi\u00f3n 1.8.139 mediante el bloqueo de claves de consulta URL que coinciden con el patr\u00f3n \u2019__proto__\u2019. Sin embargo, esta mitigaci\u00f3n es incompleta: solo filtra claves \u2019__proto__\u2019 de nivel superior y no logra sanear formas anidadas como \u2019b[__proto__][polluted]=PWNED\u2019. Como resultado, una cadena de consulta URL controlada por un atacante todav\u00eda puede escribir en \u2019Object.prototype\u2019 en cualquier p\u00e1gina que cargue \u2019main.js\u2019. La versi\u00f3n 1.8.223 contiene una correcci\u00f3n actualizada."
    }
  ],
  "id": "CVE-2026-53592",
  "lastModified": "2026-10-24T20:10:00.137",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 4.6,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 1.2,
        "impactScore": 3.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-53592",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-21T14:42:11.918943Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-20T20:16:44.747",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-w5fc-8pp3-f755"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-w5fc-8pp3-f755"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1321"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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